Luper, S. (2002). A guide to ethics. Boston: McGraw-Hill.
Chicago Style aipamenaLuper, Steven. A Guide to Ethics. Boston: McGraw-Hill, 2002.
MLA aipamenaLuper, Steven. A Guide to Ethics. Boston: McGraw-Hill, 2002.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.