Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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