Keegan, Desmond <br/><br/>
Theoretical principles of distance education 
Desmond Keegan 
 - New York  Routledge  1993 
 - xiii, 272p 
 - Routledge studies in distance education/Desmond Keegan .
<br/><br/><label>ISBN: </label>9780415089425  1088.00 
<br/><br/><label>Dewey Class. No.: </label>371.35 T342