APA-Zitierstil (7. Ausg.)

Humphrey, D. D. (2011). Customer service (2. ed., International ed.). South-Western Cengage Learning.

Chicago-Zitierstil (17. Ausg.)

Humphrey, Doris D. Customer Service. 2. ed., International ed. Mason, Ohio: South-Western Cengage Learning, 2011.

MLA-Zitierstil (9. Ausg.)

Humphrey, Doris D. Customer Service. 2. ed., International ed. South-Western Cengage Learning, 2011.