Fieser, J., & Lillegard, N. (2002). A historical introduction to philosophy: Texts and interactive guides. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Fieser, James, agus Norman Lillegard. A Historical Introduction to Philosophy: Texts and Interactive Guides. New York: Oxford University Press, 2002.
Lua MLA (8ú heag.)Fieser, James, agus Norman Lillegard. A Historical Introduction to Philosophy: Texts and Interactive Guides. Oxford University Press, 2002.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.