Greek Philosophy [Internet Encyclopedia of Philosophy]
Ludwig Wittgenstein [Internet Encyclopedia of Philosophy]
John Dewey [Internet Encyclopedia of Philosophy]
George Berkeley [Internet Encyclopedia of Philosophy]
Anaximander [Internet Encyclopedia of Philosophy]
Internet Encyclopedia of Philosophy: René Descartes
Augustine [Internet Encyclopedia of Philosophy]
Philosopher: Marcus Tullius Cicero
Internet Encyclopedia of Philosophy: Herbert Spencer
Cyrenaics [Internet Encyclopedia of Philosophy]
Neoplatonism [Internet Encyclopedia of Philosophy]
Ayn Rand [Internet Encyclopedia of Philosophy]
George Herbert Mead [Internet Encyclopedia of Philosophy]
Internet Encyclopedia of Philosophy: Heraclitus
Internet Encyclopedia of Philosophy: Plato
The Internet Encyclopedia of Philosophy: Epicurus
Internet Encyclopedia of Philosophy: Ethics
Internet Encyclopedia of Philosophy: Aristotle
Natural Law [Internet Encyclopedia of Philosophy]
Internet Encyclopedia of Philosophy: Plotinus
Anaxagoras (c. 500-428 BCE) [Internet Encyclopedia of Philosophy]
Protagoras [Internet Encyclopedia of Philosophy]
Egoism - Internet Encyclopedia of Philosophy
Joseph Butler [Internet Encyclopedia of Philosophy]
Internet Encyclopedia of Philosophy: Anselm of Canterbury