Guthrie, W. K. C. (1977). A history of Greek philosophy: By W. K. C. Guthrie. Cambridge Univ. Press.
Lua i Stíl Chicago (17ú heag.)Guthrie, William Keith Chambers. A History of Greek Philosophy: By W. K. C. Guthrie. Cambridge [u.a.]: Cambridge Univ. Press, 1977.
Lua MLA (8ú heag.)Guthrie, William Keith Chambers. A History of Greek Philosophy: By W. K. C. Guthrie. Cambridge Univ. Press, 1977.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.