Stumpf, S. E. (1994). Philosophical problems: Selected readings in Socratic dialogues, ethics, religion, political philosophy, epistemology, and metaphysics (4th ed.). McGraw-Hill.
Chicago-referens (17:e uppl.)Stumpf, Samuel Enoch. Philosophical Problems: Selected Readings in Socratic Dialogues, Ethics, Religion, Political Philosophy, Epistemology, and Metaphysics. 4th ed. New York: McGraw-Hill, 1994.
MLA-referens (9:e uppl.)Stumpf, Samuel Enoch. Philosophical Problems: Selected Readings in Socratic Dialogues, Ethics, Religion, Political Philosophy, Epistemology, and Metaphysics. 4th ed. McGraw-Hill, 1994.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.