McGreal, I. P. (1970). Problems of ethics. Chandler.
Lua i Stíl Chicago (17ú heag.)McGreal, Ian Philip. Problems of Ethics. Chandler, 1970.
Lua MLA (9ú heag.)McGreal, Ian Philip. Problems of Ethics. Chandler, 1970.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.