APA-Zitierstil (7. Ausg.)

Bopp, R. E. (1995). Reference and information services: An introduction (2. ed.). Libr. Unlimited.

Chicago-Zitierstil (17. Ausg.)

Bopp, Richard E. Reference and Information Services: An Introduction. 2. ed. Englewood, Colo: Libr. Unlimited, 1995.

MLA-Zitierstil (9. Ausg.)

Bopp, Richard E. Reference and Information Services: An Introduction. 2. ed. Libr. Unlimited, 1995.