APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Edwards, Chris, John Ward, and Andy Bytheway. The Essence of Information Systems. New York: Prentice-Hall, 1991.

MLA (9th ed.) Citation

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