Bagdady, A. Y., & Korth, W. (1990). A comparative study of eighthï؟1/2grade studentsï؟1/2 spatial ability in rural and urban schools of Makkah, Saudi Arabia. University of Pittsburgh.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Bagdady, Abdullah Y., و Willard Korth. A Comparative Study of Eighthï؟1/2grade Studentsï؟1/2 Spatial Ability in Rural and Urban Schools of Makkah, Saudi Arabia. Pittsburgh: University of Pittsburgh, 1990.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Bagdady, Abdullah Y., و Willard Korth. A Comparative Study of Eighthï؟1/2grade Studentsï؟1/2 Spatial Ability in Rural and Urban Schools of Makkah, Saudi Arabia. University of Pittsburgh, 1990.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.