Παραπομπή APA

Cunnigham William P. (2005). Environmental science: A global concern. McGraw Hill.

Παραπομπή Chicago Style

Cunnigham William P. Environmental Science: A Global Concern. London: McGraw Hill, 2005.

Παραπομπή MLA

Cunnigham William P. Environmental Science: A Global Concern. McGraw Hill, 2005.