APA-viite (7. p.)
Bopp, R. E., & Smith, L. C. (2011). Reference and information services: An introduction (4th ed.). Libraries Unlimited.
Chicago-viite (17. p.)
Bopp, Richard E., ja Linda C. Smith. Reference and Information Services: An Introduction. 4th ed. Santa Barbara, Calif: Libraries Unlimited, 2011.
MLA-viite (9. p.)
Bopp, Richard E., ja Linda C. Smith. Reference and Information Services: An Introduction. 4th ed. Libraries Unlimited, 2011.
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