Osborne, C. (2004). Presocratic Philosophy: A Very Short Introduction (1st.). Oxford.
Lua i Stíl Chicago (17ú heag.)Osborne, Catherine. Presocratic Philosophy: A Very Short Introduction. 1st. Oxford, 2004.
Lua MLA (9ú heag.)Osborne, Catherine. Presocratic Philosophy: A Very Short Introduction. 1st. Oxford, 2004.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.