Citazione APA

Bopp, R. E., & Smith, L. C. (2001). Reference and information services: An Introduction (3rd ed.). Libraries Unlimited.

Stile di citazione Chicago

Bopp, Richard E., e Linda C. Smith. Reference and Information Services: An Introduction. 3rd ed. Englewood, Colorado: Libraries Unlimited, 2001.

Citazione MLA

Bopp, Richard E., e Linda C. Smith. Reference and Information Services: An Introduction. 3rd ed. Libraries Unlimited, 2001.