Cita APA (7th ed.)

KEEGAN, D. (1996). Foundations of distance education.-- Ed. 3. Routledge.

Cita Chicago (17th ed.)

KEEGAN, Desmond. Foundations of Distance Education.-- Ed. 3. London: Routledge, 1996.

Cita MLA (9th ed.)

KEEGAN, Desmond. Foundations of Distance Education.-- Ed. 3. Routledge, 1996.