Cita APA (7th ed.)

Edwards, C., Ward, J., & Bytheway, A. (1991). The essence of information systems. Prentice Hall.

Cita Chicago (17th ed.)

Edwards, Chris, John Ward, i A. Bytheway. The Essence of Information Systems. New York: Prentice Hall, 1991.

Cita MLA (9th ed.)

Edwards, Chris, et al. The Essence of Information Systems. Prentice Hall, 1991.