APA aipamena

Oberhaus,Mary Ann. (1993). Professional selling: A relationship process. The Dryden Press.

Chicago Style aipamena

Oberhaus,Mary Ann. Professional Selling: A Relationship Process. Forth Worth: The Dryden Press, 1993.

MLA aipamena

Oberhaus,Mary Ann. Professional Selling: A Relationship Process. The Dryden Press, 1993.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.