Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.