APA (7th ed.) Citation

Sage Publications & Gregory, K. J. (2009). Environmental sciences: A student's companion. SAGE.

Chicago Style (17th ed.) Citation

Sage Publications and K. J. Gregory. Environmental Sciences: A Student's Companion. Los Angeles, [Calif.] ; London: SAGE, 2009.

MLA (9th ed.) Citation

Sage Publications and K. J. Gregory. Environmental Sciences: A Student's Companion. SAGE, 2009.