El Rashed، I. M.، و Andersen، H. O. (1984). INFLUENCE OF TEACHER WAIT-TIME AND QUESTION LEVEL ON EIGHTH GRADE STUDENTS' SCIENCE ACHIEVEMENT AND ATTITUDES TOWARD SCIENCE IN SAUDI ARABIA (رسالة دكتوراه غير منشورة). Indiana University، إنديانا. مسترجع من http://search.mandumah.com/Record/613246
El Rashed، Ibraheem Mohammad، و Hans O. Andersen. "INFLUENCE OF TEACHER WAIT-TIME AND QUESTION LEVEL ON EIGHTH GRADE STUDENTS' SCIENCE ACHIEVEMENT AND ATTITUDES TOWARD SCIENCE IN SAUDI ARABIA" رسالة دكتوراه. Indiana University، إنديانا، 1984. مسترجع من http://search.mandumah.com/Record/613246