Cita APA (7th ed.)

Katz, W. A., & Fraley, R. A. (1987). International aspects of reference and information services. Haworth.

Cita Chicago (17th ed.)

Katz, William A., i Ruth A. Fraley. International Aspects of Reference and Information Services. New York: Haworth, 1987.

Cita MLA (9th ed.)

Katz, William A., i Ruth A. Fraley. International Aspects of Reference and Information Services. Haworth, 1987.