Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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