KATZ, W. A. (1992). Introduction to reference work volume II: Referenceservices and reference processes.-- ed.6. McGraw-Hill.
Chicago-čujuhus (17. p.)KATZ, William A. Introduction to Reference Work Volume II: Referenceservices and Reference Processes.-- Ed.6. New York: McGraw-Hill, 1992.
MLA-čujuhus (9. p.)KATZ, William A. Introduction to Reference Work Volume II: Referenceservices and Reference Processes.-- Ed.6. McGraw-Hill, 1992.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.