Al-Shagroud, H. M., & DeFigio, N. F. (1987). An examination of in-service training needs of secondary school principals in Saudi Arabia \. University of Pittsburgh.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Al-Shagroud, Hamad M., و Nicholas F. DeFigio. An Examination of In-service Training Needs of Secondary School Principals in Saudi Arabia \. Pittsburgh: University of Pittsburgh, 1987.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Al-Shagroud, Hamad M., و Nicholas F. DeFigio. An Examination of In-service Training Needs of Secondary School Principals in Saudi Arabia \. University of Pittsburgh, 1987.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.