APA-referens (7:e uppl.)

Bopp, R. E., & Smith, L. C. (2011). Reference and information services: An introduction (4th ed.). Libraries Unlimited.

Chicago-referens (17:e uppl.)

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

MLA-referens (8:e uppl.)

Bopp, Richard E., och Linda C. Smith. Reference and Information Services: An Introduction. 4th ed. Libraries Unlimited, 2011.