Dyfyniad APA

Whitelaw, K. (1997). ISO 14001 environmental systems handbook. Butterworth Heinemann.

Dyfyniad Arddull Chicago

Whitelaw, Ken. ISO 14001 Environmental Systems Handbook. Oxford; Boston: Butterworth Heinemann, 1997.

Dyfyniad MLA

Whitelaw, Ken. ISO 14001 Environmental Systems Handbook. Butterworth Heinemann, 1997.

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