Davis, Robert H.,  1922-, <br/><br/>
Learning system design :  an approach to the improvement of instruction / 
by Robert H. Davis, Lawrence T. Alexander and Stephen L. Yelon. 
 - New York :  McGraw-Hill,  1974. 
 - ix, 342 p.:  ill. ;  25 cm. 
<br/><br/>Bibliography: p. 331. 
<br/><br/><label>ISBN: </label>0070743347 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Instructional systems--Design.