Howard , Caroline  . <br/><br/>
Encyclopedia of distance learing /  
by Caroline Howard... et al  etc. 
 - London :   Idea Group Reference ,   2005 
 - 4 vols :  
<br/><br/><label>ISBN: </label>159140555-6 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Education
<br/><br/><label>Dewey Class. No.: </label>Tk  / P5.4