APA (7th ed.) Zitazioa
Porter, B. F. (2010). What the tortoise taught us: The story of philosophy. Rowman & Littlefield Publishers.
Chicago Style (17th ed.) Zitazioa
Porter, Burton Frederick. What the Tortoise Taught Us: The Story of Philosophy. Lanham, Md.: Rowman & Littlefield Publishers, 2010.
MLA (9th ed.) Zitazioa
Porter, Burton Frederick. What the Tortoise Taught Us: The Story of Philosophy. Rowman & Littlefield Publishers, 2010.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.