Cita APA (7a ed.)
Cunningham, W. P. (1997). Environmental science: A global concern (4th.ed.). Wm.C.Brown.
Cita Chicago Style (17a ed.)
Cunningham, William P. Environmental Science: A Global Concern. 4th.ed. Dubuque: Wm.C.Brown, 1997.
Cita MLA (9a ed.)
Cunningham, William P. Environmental Science: A Global Concern. 4th.ed. Wm.C.Brown, 1997.
Precaución: Estas citas no son 100% exactas.