Clark, Ruth Colvin. <br/><br/>
E-Learning and the science of instruction :  proven guidelines for consumers and designers of multimedia learning / 
Ruth Colvin Clark and Richard E. Mayer. 
 - 1st ed. 
 - San Francisco, CA :  Jossey-Bass/Pfeiffer,  c2003. 
 - xiv, 322 p. :  ill. ;  25 cm. 
<br/><br/>Includes bibliographical references (p. 295-307) and index. 
<br/><br/><label>ISBN: </label>9780787960513 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Business education--Computer-assisted instruction.