Solomon, R. (2008). The art of client service. Kaplan Publishing.
Chicago Style aipamenaSolomon, Robert. The Art of Client Service. New York, NY: Kaplan Publishing, 2008.
MLA aipamenaSolomon, Robert. The Art of Client Service. Kaplan Publishing, 2008.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.