APA (7 वां संस्करण) प्रशस्ति पत्र
ebrary, Inc, & Erdmenger, C. (2003). Buying into the environment: Experiences, opportunities and potential for eco-procurement. Greenleaf Pub..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
ebrary, Inc, और Christoph Erdmenger. Buying into the Environment: Experiences, Opportunities and Potential for Eco-procurement. Sheffield: Greenleaf Pub., 2003.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
ebrary, Inc, और Christoph Erdmenger. Buying into the Environment: Experiences, Opportunities and Potential for Eco-procurement. Greenleaf Pub., 2003.
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