APA (7 वां संस्करण) प्रशस्ति पत्र

Cunningham, W. P. (1997). Environmental science: A global concern (4th.ed.). Wm.C.Brown.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Cunningham, William P. Environmental Science: A Global Concern. 4th.ed. Dubuque: Wm.C.Brown, 1997.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

Cunningham, William P. Environmental Science: A Global Concern. 4th.ed. Wm.C.Brown, 1997.