APA (7 वां संस्करण) प्रशस्ति पत्र
ebrary, Inc, & Sheldon, C. (1997). ISO 14001 and beyond: Environmental management systems in the real world. Greenleaf Pub..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
ebrary, Inc, और Christopher Sheldon. ISO 14001 and Beyond: Environmental Management Systems in the Real World. Sheffield: Greenleaf Pub., 1997.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
ebrary, Inc, और Christopher Sheldon. ISO 14001 and Beyond: Environmental Management Systems in the Real World. Greenleaf Pub., 1997.
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