Fields, Tim. <br/><br/>
Social game design :  monetization methods and mechanics / 
Tim Fields, Brandon Cotton. 
 - Waltham, MA :  Morgan Kaufmann,  2012. 
 - xv, 262 p. :  ill ;  24 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>9780240817668  RM139.35 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computer games--Design.