Hirko, B., & Ross, M. B. (2004). Virtual reference training: The complete guide to providing anytime, anywhere answers. American Library Association.
Čikaški stil citiranja (17. izdanje)Hirko, Buff, i Mary Bucher Ross. Virtual Reference Training: The Complete Guide to Providing Anytime, Anywhere Answers. Chicago: American Library Association, 2004.
MLA način citiranja (9. izdanje)Hirko, Buff, i Mary Bucher Ross. Virtual Reference Training: The Complete Guide to Providing Anytime, Anywhere Answers. American Library Association, 2004.
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