APA (7 ম সংস্করণ) উদ্ধৃতি

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

শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতি

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

M.L.A (9 ম সংস্করণ) উদ্ধৃতি

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