Παραπομπή σε μορφή APA (7η εκδ.)

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

Παραπομπή σε μορφή Chicago (17η εκδ.)

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

Παραπομπή σε μορφή MLA (9th εκδ.)

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