Garrison, D. Randy <br/><br/>
E-learning in the 21st century : a framework for research and practice / 
Garrison, D. Randy. 
 - 3rd ed. 
 - New York:  Routledge,  2017. 
 - xvi, 202p.; 23cm. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>9781138953567 
<br/><br/><label>Dewey Class. No.: </label>378.00285 GAR