Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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