Edwards, P. (1967). The encyclopedia of philosophy. Macmillan.
Lua i Stíl Chicago (17ú heag.)Edwards, Paul. The Encyclopedia of Philosophy. Estados Unidos: Macmillan, 1967.
Lua MLA (9ú heag.)Edwards, Paul. The Encyclopedia of Philosophy. Macmillan, 1967.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.