SCHWARTY, <br/><br/>
LEARNING PEXL MAKING EASY THINGS EASY AND HARD THNIGS / 
SCHWARTY. 
 - 7th ED. 
 -  O'REILLY MEDIA,  2017. 
 - 369 P. ; 
<br/><br/><label>ISBN: </label>
<br/><br/><label>Dewey Class. No.: </label>005.133  / SCH