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, Jean-Jacques Rousseau, John Locke, José Ortega y Gasset, Leon Festinger, Meša Selimović, Milan Kundera, Niccolo Machiavelli, Oscar Wilde, Plato, Sigmund Freud, Stanley Milgram, Thomas Hobbes, Thomas Sowell, Viktor Frankl, William Shirer.