The hidden costs of reward  : new perspectives on the psychology of human motivation / 
edited by Mark R. Lepper, David Greene. 
 - Hillsdale, N.J. :  Lawrence Erlbaum Associates,  1978. 
 - xiii, 262 p. ;  24 cm. 
<br/><br/>Includes bibliographical references and indexes. 
<br/><br/><label>ISBN: </label>047026487X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Reward (Psychology).<br/>Motivation (Psychology).