Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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