Velasquez, M. G. (2008). Philosophy: A text with readings (10th ed.). Thomson/Wadsworth.
Lua i Stíl Chicago (17ú heag.)Velasquez, Manuel G. Philosophy: A Text with Readings. 10th ed. Australia ; Belmont, CA: Thomson/Wadsworth, 2008.
Lua MLA (9ú heag.)Velasquez, Manuel G. Philosophy: A Text with Readings. 10th ed. Thomson/Wadsworth, 2008.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.