Some of the authors I recommend:
Aldous Huxley, Aristotle, A. S. Neill, Baruch Spinoza, Bertrand Russell, B.F. Skinner, Carl Jung, David Hume, Francis Bacon, Friedrich Nietzsche, Fyodor Dostoevsky, George Orwell, Ivo Andric, John Locke, Leon Festinger, Meša Selimović, Milan Kundera, Niccolo Machiavelli, Plato, Sigmund Freud, Stanley Milgram, Thomas Hobbes, Thomas Sowell, Viktor Frankl, William Shirer.