Cita APA (7th ed.)
Koehn, D. (1994). The ground of professional ethics. Routlege.
Cita Chicago (17th ed.)
Koehn, Daryl. The Ground of Professional Ethics. London ; New York: Routlege, 1994.
Cita MLA (9th ed.)
Koehn, Daryl. The Ground of Professional Ethics. Routlege, 1994.
Atenció: Aquestes cites poden no estar 100% correctes.