Al Essa، J. M. S. M.، و Smadi، O. M. (1982). The relationship between students achievement in English in general secondary certificate exam and their attitudes and motivation toward learning English (رسالة ماجستير غير منشورة). جامعة اليرموك، اربد. مسترجع من http://search.mandumah.com/Record/741531
Al Essa، Jamal Mhm'd Saied Mustafa، و Oqlah Mahmoud Smadi. "The Relationship between Students Achievement in English in General Secondary Certificate Exam and Their Attitudes and Motivation Toward Learning English" رسالة ماجستير. جامعة اليرموك، اربد، 1982. مسترجع من http://search.mandumah.com/Record/741531