APA aipamena

National productivity council. Cement industry in France, USA and Britain. National productivity council.

Chicago Style aipamena

National productivity council. Cement Industry in France, USA and Britain. New Delhi: National productivity council.

MLA aipamena

National productivity council. Cement Industry in France, USA and Britain. National productivity council.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.