Bahm, A. J. (1980). Ethics: The science of oughtness. Archie J. Bahm.
Lua i Stíl Chicago (17ú heag.)Bahm, Archie J. Ethics: The Science of Oughtness. Albuquerque: Archie J. Bahm, 1980.
Lua MLA (9ú heag.)Bahm, Archie J. Ethics: The Science of Oughtness. Archie J. Bahm, 1980.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.