Cita APA (7th ed.)

Oppenheim, C., & Citroen, C. L. (1989). Perspectives in information management 1. Butterworths.

Cita Chicago (17th ed.)

Oppenheim, Charles, i Charles L. Citroen. Perspectives in Information Management 1. London: Butterworths, 1989.

Cita MLA (9th ed.)

Oppenheim, Charles, i Charles L. Citroen. Perspectives in Information Management 1. Butterworths, 1989.