Official Guide for GMAT/  Review/ 

 - 9th ed. 
 - USA;  Educational Testing Service;  1998 
 - 514 p.:  27.5 cm. 
<br/><br/><label>ISBN: </label>0-446-39638-9 
<br/><br/><label>Dewey Class. No.: </label>020  / GMA