Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (8a ed.)

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