Cita APA (7a ed.)

Keegan, D. (1996). Foundations of distance education (3rd ed.). Routledge.

Cita Chicago Style (17a ed.)

Keegan, Desmond. Foundations of Distance Education. 3rd ed. London [etc.]: Routledge, 1996.

Cita MLA (9a ed.)

Keegan, Desmond. Foundations of Distance Education. 3rd ed. Routledge, 1996.