Khan, A. U., & unknown. (1981). An Investigation of properties of concrete made with concrete rubble as aggregate.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Khan, Asfahan Ullah, و unknown. An Investigation of Properties of Concrete Made with Concrete Rubble as Aggregate. 1981.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Khan, Asfahan Ullah, و unknown. An Investigation of Properties of Concrete Made with Concrete Rubble as Aggregate. 1981.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.