United Nations Industrial Development Organization. (1972). The manufacture and utilizatin of portland cement. New York: United Nations.
استشهاد بنمط شيكاغوUnited Nations Industrial Development Organization. The Manufacture and Utilizatin of Portland Cement. New York: United Nations, 1972.
MLA استشهادUnited Nations Industrial Development Organization. The Manufacture and Utilizatin of Portland Cement. New York: United Nations, 1972.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.