Cita APA

Keegan, D. (1990). Foundations of distance education (2nd. ed.). Routledge.

Citación estilo Chicago

Keegan, Desmond. Foundations of Distance Education. 2nd. ed. London: Routledge, 1990.

Cita MLA

Keegan, Desmond. Foundations of Distance Education. 2nd. ed. Routledge, 1990.