APA (7th ed.) Citation

Harry, K., John, M., & Keegan, D. (1993). Distance education: New perspectives. Routledge.

Chicago Style (17th ed.) Citation

Harry, Keith, Magnus John, and Desmond Keegan. Distance Education: New Perspectives. London: Routledge, 1993.

MLA (9th ed.) Citation

Harry, Keith, et al. Distance Education: New Perspectives. Routledge, 1993.