HILLARY, R. (2000). ISO 14001: Case studies and practical experiences. greenleaf.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHILLARY, Ruth. ISO 14001: Case Studies and Practical Experiences. greenleaf, 2000.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHILLARY, Ruth. ISO 14001: Case Studies and Practical Experiences. greenleaf, 2000.
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