APA (7th ed.) Zitazioa

Barnes, J. (1987). Early greek philosophy. Penguin Books.

Chicago Style (17th ed.) Zitazioa

Barnes, Jonathan. Early Greek Philosophy. Middlesex, England: Penguin Books, 1987.

MLA (9th ed.) Zitazioa

Barnes, Jonathan. Early Greek Philosophy. Penguin Books, 1987.