Edwards, A. J. (2004). ISO 14001 environmental certification step by step (Revised 1st ed.). Elsevier Butterworth-Heinemann.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEdwards, A. J. ISO 14001 Environmental Certification Step by Step. Revised 1st ed. Oxford: Elsevier Butterworth-Heinemann, 2004.
एमएलए (9वां संस्करण) प्रशस्ति पत्रEdwards, A. J. ISO 14001 Environmental Certification Step by Step. Revised 1st ed. Elsevier Butterworth-Heinemann, 2004.
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