Dyfyniad APA

KATZ, W. A. (1992). Introduction to reference work volume II: Referenceservices and reference processes.-- ed.6. McGraw-Hill.

Dyfyniad Arddull Chicago

KATZ, William A. Introduction to Reference Work Volume II: Referenceservices and Reference Processes.-- Ed.6. New York: McGraw-Hill, 1992.

Dyfyniad MLA

KATZ, William A. Introduction to Reference Work Volume II: Referenceservices and Reference Processes.-- Ed.6. McGraw-Hill, 1992.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.