Dhafar, T. O., & Hatfield, R. (1986). A survey of the English language supervisors and teachers perceptions of the English language curriculum in the secondary schools of Saudi Arabia. Michigan State University, Department of Teacher Education.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Dhafar, Talal Obaid, و Robert Hatfield. A Survey of the English Language Supervisors and Teachers Perceptions of the English Language Curriculum in the Secondary Schools of Saudi Arabia. Michigan: Michigan State University, Department of Teacher Education, 1986.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Dhafar, Talal Obaid, و Robert Hatfield. A Survey of the English Language Supervisors and Teachers Perceptions of the English Language Curriculum in the Secondary Schools of Saudi Arabia. Michigan State University, Department of Teacher Education, 1986.