Dyfyniad APA

National productivity council. (1965). Refractories industry in USA, Britain and West Germany. National productivity council.

Dyfyniad Arddull Chicago

National productivity council. Refractories Industry in USA, Britain and West Germany. New Delhi: National productivity council, 1965.

Dyfyniad MLA

National productivity council. Refractories Industry in USA, Britain and West Germany. National productivity council, 1965.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.