APA (7th ed.) Citation

Keegan, D., Holmberg, B., & Sewart, D. (1988). Distance education: International perspectives. Routledge.

Chicago Style (17th ed.) Citation

Keegan, Desmond, Börje Holmberg, and David Sewart. Distance Education: International Perspectives. London ; New York: Routledge, 1988.

MLA (8th ed.) Citation

Keegan, Desmond, et al. Distance Education: International Perspectives. Routledge, 1988.