Mezher، A. A. S.، و Ahlawat، K. S. (1980). An investigation into the effect of the early start English as a foreign language in Jordan private schools on students' achievement in English at higher grades in state schools (رسالة ماجستير غير منشورة). جامعة اليرموك، اربد. مسترجع من http://search.mandumah.com/Record/719934
Mezher، Abd Allah Saleem، و Kapur S. Ahlawat. "An Investigation Into the Effect of the Early Start English As a Foreign Language in Jordan Private Schools On Students' Achievement in English At Higher Grades in State Schools" رسالة ماجستير. جامعة اليرموك، اربد، 1980. مسترجع من http://search.mandumah.com/Record/719934