Ahajjar، A. A. O.، و Johanson، G. (1997). A COMPARATIVE STUDY OF The EFFECT OF TESTING STRATEGY AND TEST ITEM FORMAT WITH SAUDI ARABIAN STUDENTS' STATISTICAL PERFORMANCE AND ATTITUDES (رسالة دكتوراه غير منشورة). Ohio University، أثينس. مسترجع من http://search.mandumah.com/Record/611869
Ahajjar، Abd Allah O.، و George Johanson. "A COMPARATIVE STUDY OF The EFFECT OF TESTING STRATEGY AND TEST ITEM FORMAT WITH SAUDI ARABIAN STUDENTS' STATISTICAL PERFORMANCE AND ATTITUDES" رسالة دكتوراه. Ohio University، أثينس، 1997. مسترجع من http://search.mandumah.com/Record/611869