Keegan,Desmond. <br/><br/>
theoretical principles of distance education/ 
Desmond Keegan. 
 - London:  Routledge,  c 1993. 
 - ix,272p.:ill.;col.  includes blbliographical references and index.  22 cm. 
<br/><br/><label>ISBN: </label>0-415-08942-5 
<br/><br/><label>Subjects--Topical Terms: </label>--Educational technology--title--Distance education--Education--Aims and objectives
<br/><br/><label>Dewey Class. No.: </label>378.03 THE