Friedrich Nietzsche, Thomas Paine, Emma Goldman, Bertrand Russell, Mikhail Bakunin, Percy Bysshe Shelley, David Hume, Baron d'Holbach, Jean Meslier, Dr. D.M. Brooks & Upton Sinclair
Thomas More, Marcus Aurelius Antoninus, Sun Tzu, Vātsyāyana, Voltaire, Edwin A. Abbott, Aristotle, Dale Carnegie, Gilbert Keith Chesterton, René Descartes, Epictetus, Sigmund Freud, Hermann Hesse, David Hume, Lao Tzu, D. H. Lawrence, Niccolò Machiavelli, John Mill, Prentice Mulford, Friedrich Nietzsche, Plato, Bertrand Russell, H.G. Wells & Frances Bacon
