APA aipamena

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

Chicago Style aipamena

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

MLA aipamena

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

Kontuz: berrikusi erreferentzia hauek erabili aurretik.