APA ציטוט

Cunninggham, W. P. (2003). Environmental science: A global concern. WCB/McGraw-Hill.

Trích dẫn kiểu Chicago

Cunninggham, William P. Environmental Science: A Global Concern. WCB/McGraw-Hill, 2003.

ציטוט MLA

Cunninggham, William P. Environmental Science: A Global Concern. WCB/McGraw-Hill, 2003.