Level up : The guide to great video game design 
Scott, Rogers. 
 - Second edition. 
 -  John Wiley and Son's Pte.Ltd.  2014 
 - 535 pages. 
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<br/><br/><label>ISBN: </label>978-1-11887716-6 
<br/><br/><label>Dewey Class. No.: </label>794.8 K7241 2014