Usiskin, Zalman <br/><br/>
The Classification of Quadrilaterals:  A Study of Definition/ 
Zalman Usiskin and Jennifer Griffin 
 -  Information Age Publishing,  2008 
 - xvi;104p. 
<br/><br/><label>ISBN: </label>9781593116941 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Quadrilaterals