Cita APA

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

Chicago Edition Citation

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

Cita MLA

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