TY  - BOOK
AU  - Usiskin,Zalman
AU  - Griffin,Jennifer
AU  - Witonsky,David
AU  - Willmore,Edwin
TI  - The classification of quadrilaterals: a study of definition 
T2  - Research in mathematics education
SN  - 1593116942
AV  - QA482 .U75 2008
CY  - ©2008
KW  - Quadrilaterals
KW  - Geometry, Plane
N1  - Includes bibliographical references (pages 83-84)
ER  -