Lua APA (7ú heag.)
Nagel, T. (1978). The possibility of altruism. Princeton University Press.
Lua i Stíl Chicago (17ú heag.)
Nagel, Thomas. The Possibility of Altruism. Princeton: Princeton University Press, 1978.
Lua MLA (9ú heag.)
Nagel, Thomas. The Possibility of Altruism. Princeton University Press, 1978.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.