Holmberg, Borje Keegan, Desmond, ed <br/><br/>
Theory and practice of distance education 

 - 2nd ed. 
 - London  Routledge  1989 
 - xii, 246 p.; 22cm. 
 - Routledge studies in distance education .
<br/><br/><label>ISBN: </label>415112923 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Distance education<br/>Education<br/>Open learning<br/>University extension