APA (7 वां संस्करण) प्रशस्ति पत्र
ebrary, Inc, & Conrad, J. (1998). Environmental management in European companies: Success stories and evaluation. Gordon abd Breach Science Publishers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
ebrary, Inc, और Jobst Conrad. Environmental Management in European Companies: Success Stories and Evaluation. Amsterdam, The Netherlands: Gordon abd Breach Science Publishers, 1998.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
ebrary, Inc, और Jobst Conrad. Environmental Management in European Companies: Success Stories and Evaluation. Gordon abd Breach Science Publishers, 1998.
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