El Rashed, I. M., & Andersen, H. O. (1984). Influence of teacher waittime and question level on eighth grade students science achievement and attitudes toward science in Saudi Arabia. Indiana University.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)El Rashed, Ibraheem Mohammad, و Hans O. Andersen. Influence of Teacher Waittime and Question Level on Eighth Grade Students Science Achievement and Attitudes Toward Science in Saudi Arabia. Indiana: Indiana University, 1984.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)El Rashed, Ibraheem Mohammad, و Hans O. Andersen. Influence of Teacher Waittime and Question Level on Eighth Grade Students Science Achievement and Attitudes Toward Science in Saudi Arabia. Indiana University, 1984.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.