APA (7e ed.) Bronvermelding

Pursell, C. W. (1973). From conservation to ecology: The development of environmental concern. Crowell.

Chicago (17e ed.) Bronvermelding

Pursell, Carroll W. From Conservation to Ecology: The Development of Environmental Concern. New York: Crowell, 1973.

MLA (9e ed.) Bronvermelding

Pursell, Carroll W. From Conservation to Ecology: The Development of Environmental Concern. Crowell, 1973.