Keegan, Desmond. Foundations of distance education / Desmond Keegan. - 3rd ed. - London ; New York : Routledge, 1996. - xiii, 224 p. ; 22 cm. - Routledge studies in distance education . Includes bibliographical references and index. ISBN: 9780415139090 Subjects--Topical Terms: Distance education. LC Class. No.: LC5800 / .K43 1996