Al Hadlaq، M. S.، و Ely، C. (2003). RETENTION OF WORDS LEARNED INCIDENTALLY BY SAUDI EFL LEARNERS THROUGH WORKING ON VOCABULARY LEARNING TASKS CONSTRUCTED TO ACTIVATE VARYING DEPTHS OF PROCESSING (رسالة دكتوراه غير منشورة). Ball State University، مونسي. مسترجع من http://search.mandumah.com/Record/620542
Al Hadlaq، Mohammed S.، و Christopher Ely. "RETENTION OF WORDS LEARNED INCIDENTALLY BY SAUDI EFL LEARNERS THROUGH WORKING ON VOCABULARY LEARNING TASKS CONSTRUCTED TO ACTIVATE VARYING DEPTHS OF PROCESSING" رسالة دكتوراه. Ball State University، مونسي، 2003. مسترجع من http://search.mandumah.com/Record/620542