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 A. 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.