Merrill, M. David,  1937- <br/><br/>
First principles of instruction :  assessing and designing effective, efficient, and engaging instruction / 
M. David Merrill. 
 - San Francisco, CA :  Pfeiffer,  2013. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>9780470900406 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Educational technology.<br/>Instructional systems--Design.