APA aipamena

Edwards, A. J. (2001). ISO 14001 environmental certification: Step by step. Butterworth Heinemann.

Chicago Style aipamena

Edwards, A. J. ISO 14001 Environmental Certification: Step by Step. Oxford: Butterworth Heinemann, 2001.

MLA aipamena

Edwards, A. J. ISO 14001 Environmental Certification: Step by Step. Butterworth Heinemann, 2001.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.