APA (7 वां संस्करण) प्रशस्ति पत्र

Sheldon, C., & Yoxon, M. (2007). Environmental management systems: A step-by-step guide to implementation and maintenance (3rd ed.). Earthscan.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Sheldon, Christopher, और Mark Yoxon. Environmental Management Systems: A Step-by-step Guide to Implementation and Maintenance. 3rd ed. London ; Sterling, VA: Earthscan, 2007.

एमएलए (8वां संस्करण) प्रशस्ति पत्र

Sheldon, Christopher, और Mark Yoxon. Environmental Management Systems: A Step-by-step Guide to Implementation and Maintenance. 3rd ed. Earthscan, 2007.