Barnes, J. (1987). Early Greek philosophy. Penguin books.
Lua i Stíl Chicago (17ú heag.)Barnes, Jonathan. Early Greek Philosophy. New York: Penguin books, 1987.
Lua MLA (9ú heag.)Barnes, Jonathan. Early Greek Philosophy. Penguin books, 1987.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.