Abu Alkas، F. A. A.، و Al-Haq، F. A. (2011). The effect of the process approach and key pal e-mailing compared with the traditional approach on the writing achievement of EFL university students in Jordan and students' opinions on the three approaches (رسالة دكتوراه غير منشورة). جامعة اليرموك، إربد. مسترجع من http://search.mandumah.com/Record/741644
Abu Alkas، Fayez Abd Alrahman، و Fawwaz Al-Abed Al-Haq. "The Effect of the Process Approach and Key Pal E-mailing Compared With the Traditional Approach On the Writing Achievement of EFL University Students in Jordan and Students' Opinions On the Three Approaches" رسالة دكتوراه. جامعة اليرموك، إربد، 2011. مسترجع من http://search.mandumah.com/Record/741644