International Relations: Books in this subfield explore the relationships between countries, their governments, and their people, and may examine topics such as diplomacy, conflict, and globalization. Examples include "The Clash of Civilizations and the Remaking of World Order" by Samuel P. Huntington, "The Art of War" by Sun Tzu, and "The Origins of Totalitarianism" by Hannah Arendt.

Psychology: Books in this subfield examine the human mind and behavior, and may explore topics such as cognition, perception, personality, and mental illness. Examples include "Man's Search for Meaning" by Viktor E. Frankl, "Thinking, Fast and Slow" by Daniel Kahneman, and "The Interpretation of Dreams" by Sigmund Freud.