Garrison, D. R.  1945- <br/><br/>
Understanding distance education :  a framework for the future / 
D.R. Garrison. 
 - London ;  New York :  Routledge,  1989. 
 - 139p. 
<br/><br/><label>ISBN: </label>0415020905 
<br/><br/><label>LCCN: </label>90012017     
<br/><br/><label>Subjects--Topical Terms: </label><br/>Distance education.<br/>Educational technology.