National productivity council. (1965). Refractories industry in USA, Britain and West Germany. National productivity council.
استشهاد بنمط شيكاغوNational productivity council. Refractories Industry in USA, Britain and West Germany. New Delhi: National productivity council, 1965.
MLA استشهادNational productivity council. Refractories Industry in USA, Britain and West Germany. National productivity council, 1965.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.