Cita APA

Cunningham, W. P., & Kemp, M. J. (1994). Understanding our environment: An introduction. Dubuque, Iowa: WCB.

Citación estilo Chicago

Cunningham, William P., y Margaret J. Kemp. Understanding Our Environment: An Introduction. Dubuque, Iowa: WCB, 1994.

Cita MLA

Cunningham, William P., y Margaret J. Kemp. Understanding Our Environment: An Introduction. Dubuque, Iowa: WCB, 1994.