International Studies

First available in 1689, John Locke's Two Treatises of Government is considered one of the most important works ever written on the foundations of government. Published anonymously, it argues against the popular idea at the time that monarchs have a God-given right to rule. Instead Locke proposes that sovereignty - supreme authority - ultimately resides with the people.

One of the most influential books on economics ever written, Thomas Robert Malthus's An Essay on the Principle of Population remains one of the most controversial too. This 1798 work inspired naturalists Charles Darwin and Alfred Russel Wallace to develop the theory of natural selection. But it has also sparked criticism - Karl Marx famously called Malthus a "lackey of the bourgeoisie." Yet this hasn't stopped leading present-day environmentalists from taking up Malthus's ideas.

US psychologist Abraham Maslow's 1943 essay "A Theory of Human Motivation" established his idea of humanistic psychology as a "third force" in the field. He outlined a new approach to understanding the mind, saying humans are motivated by their need to satisfy a series of hierarchical needs, starting with the most essential first. He thought it important for the advancement of psychology to identify, group, and rank them in terms of priority.

In his 1936 book The General Theory of Employment, Interest and Money, Keynes argued that traditional economics has misunderstood the causes of unemployment. Employment is not determined by the price of labor; it is directly linked to demand in the economy. Keynes believed market economies are by nature unstable and so require government intervention. Spurred on by the social catastrophe of the Great Depression of the 1930s, Keynes set out to change the way the world thinks about economics.

US-born historian of Europe Timothy Snyder first published Bloodlands: Europe Between Hitler and Stalin in 2010. In it, he argues that previous accounts of World War II have kept Nazi and Soviet crimes unduly separate, with much more attention paid to Adolf Hitler's atrocities than Joseph Stalin's. Snyder's view is that a definitive history of the period must depict the suffering of all of the conflict's victims.

David Hume's book tackling the subject of belief in God is among the most influential in Western philosophy. Published in 1779, three years after Hume's death, without featuring the author's name, the book was deeply controversial in its day. It is now considered a masterpiece and Hume is regarded as one of the greatest philosophers writing in English.

Under the title "Civil Disobedience", American author Henry David Thoreau's essay was originally published in 1866, four years after his death in 1862. It is based on a lecture, "Resistance to Civil Government", that Thoreau gave many years earlier, in 1848. "Civil Disobedience" asked when an individual should actively oppose a government and its justice system. Thoreau's answer was that opposition was legitimate whenever government actions or institutions were unacceptable to an individual's conscience.

C. S. Lewis may be most famous for his fiction, including children's books like the Chronicles of Narnia series. But in his 1952 book Mere Christianity - originally printed as three separate pamphlets in 1942, 1943, and 1944 - this eclectic and learned man documents his complex journey from atheism to faith.

Among the general public, Descartes is probably most famous for his pronouncement "I think, therefore I am." That statement first appeared in an earlier work, but he expands on it in Meditations as he considers the idea of the mind as a separate entity to the body - the "dualist" approach. Descartes also set out to dispel skepticism - the idea that one cannot truly know anything. Using his "methodological skepticism," he showed that by doubting everything, we can know some things beyond doubt.

Richard Dawkins' 1976 investigation into the science of evolution has become an enormous success, selling over a million copies in 25 languages. Drawing on the work of renowned evolutionary scientists, Dawkins makes his argument about evolution by focusing on the gene itself. While others considered evolution to occur at the level of the individual or the group, here Dawkins sees the process of natural selection differently.

A work that had a huge influence on great thinkers including celebrated German philosopher Immanuel Kant, An Enquiry is Hume's examination of how we obtain information and form beliefs. He argues that we mainly gain knowledge through our senses, a theory known as empiricism. But while the impressions from our senses are key to our beliefs about the world, Hume argues that reason and facts play only a limited part.

Published by sociologist and historian W. E. B. Du Bois in 1903, this series of essays addresses the plight of African Americans facing everyday racism in the United States at the turn of the 20th century. It has become one of the most important works on race and identity across the world. Du Bois sets out to explain how black interaction with a white world has caused psychological anguish and argues that blacks should demand total equality in their daily realities.

In 2009's Liquidated, anthropologist Karen Z. Ho takes the tools of ethnographic research, which are traditionally used to study distant societies, and instead uses them to dissect the culture of high finance on New York's famous Wall Street. Through close observation of the daily lives of the bankers working there, and the beliefs, rituals, and timeframes that define them, Ho uncovers a distinct culture in which she finds the ultimate causes of the financial crises of recent times.

Why has gender inequality persisted for so long without revolutionary change? That's the central question Joan Wallach Scott poses in her 1998 collection of essays, Gender and the Politics of History. Scott notes that obvious economic, social, and class inequalities have produced large-scale social change, but uncovering the reality of gender inequality has not done the same.

The era after World War II saw America's urban planners treat the lives of city-dwellers with disdain. It spawned a philosophy of urban renewal that valued the efficient movement of cars more than it valued the lives of people, and that wiped out entire neighborhoods dismissed by bureaucrats as slums. Published in 1961, Jane Jacobs's The Death and Life of Great American Cities examines the shortsightedness and failure of this philosophy. The book turns away from strict statistical study and abstract planning theory in favor of observations.

Sigmund Freud was born in 1856, in Vienna, Austria, and died in London in 1939, but his reputation as "the father of psychoanalysis" lives on. The theories he introduced in his masterwork, The Interpretation of Dreams, revolutionized the treatment of mental illness in the late 19th century. Based on his success in using new techniques he had developed with his patients, and on conclusions he drew from analyzing his own dreams, Freud said that dreams offered a window into the workings of the unconscious mind.

Nineteenth-century American politician John C. Calhoun was unashamedly pro-slavery. So it may seem odd that A Disquisition on Government (1850), written in part to protect that practice, is so respected today. But South Carolina-born Calhoun was undoubtedly a great political thinker. Calhoun - who served his country as senator, vice president, secretary of war, and secretary of state - believed that "majority rule" inevitably led to abuse of power.

What is the past - and what can we really know about it? This is the big question that 20th-century French historian Lucien Febvre works his way through in 1942's The Problem of Unbelief. Relying on his own innovative technique championing "problem-based history", Febvre focuses specifically on 16th-century French writer François Rabelais to answer one controversial question: Was Rabelais, as historians had always agreed, really one of his country's first atheists?

In his 2007 book The Black Swan, Nassim Nicholas Taleb says the Black Swans of his title can appear at any time, in the form of financial crises, wars, and other unexpected events that have profound, irreversible consequences. Taleb draws on philosophy, mathematics, economics, and other disciplines to explain in plain English why we seldom prepare for these events adequately. The way our brains process knowledge lull us into believing the future will resemble the past.

Stanley Milgram was a young researcher at Yale in the 1960s when he recruited volunteers to help in a psychology experiment. These volunteers were asked to give electric shocks to "learners" whenever they got an answer to a question wrong. The "learners" were in on the deception, and were not actually receiving shocks, but the volunteers were unaware of this. To widespread surprise, Milgram reported that 40 to 65 percent of his volunteers did what the researcher told them, and gave the maximum shock to the "learners" even when they screamed in pain.