Pursell, C. W. (1973). From conservation to ecology: The development of environmental concern. Crowell.
Chicagoスタイル(17版)引用形式Pursell, Carroll W. From Conservation to Ecology: The Development of Environmental Concern. New York: Crowell, 1973.
MLA(9版)引用形式Pursell, Carroll W. From Conservation to Ecology: The Development of Environmental Concern. Crowell, 1973.
警告: この引用は必ずしも正確ではありません.