APA (7th ed.) Citation

Bopp, R. E. (2011). Reference and information services: An introduction (4. ed.). Libraries Unlimited.

Chicago Style (17th ed.) Citation

Bopp, Richard E. Reference and Information Services: An Introduction. 4. ed. Santa Barbara, Calif: Libraries Unlimited, 2011.

MLA (9th ed.) Citation

Bopp, Richard E. Reference and Information Services: An Introduction. 4. ed. Libraries Unlimited, 2011.