Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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