Oliver, P. (2000). Philosophy. Teach Yourself.
Lua i Stíl Chicago (17ú heag.)Oliver, Paul. Philosophy. London: Teach Yourself, 2000.
Lua MLA (8ú heag.)Oliver, Paul. Philosophy. Teach Yourself, 2000.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.