Lauridsen, David. <br/><br/>
The Token Economy System. 

 -  Educational Technology Pub  1978 
 - XI, 87 P. ; 23 CM. 
<br/><br/> THE INSTRUCTIONAL DESIGN LIBRARY ; V.19 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>877781230 
<br/><br/><label>Dewey Class. No.: </label>371.53 LAU 1978