Keegan, Desmond <br/><br/>
Theoretical principles of distance education 

 - London:   Routledge,   1993 
 - xiii,272p. 
 - Routledge Studies in Distance Education .
<br/><br/><label>ISBN: </label>0415089425 
<br/><br/><label>Subjects--Topical Terms: </label><br/>e-Learning
<br/><br/><label>LC Class. No.: </label>LC5215