Pursell, C. W. (1973). From conservation to ecology: The development of environmental concern. Crowell.
芝加哥风格引文Pursell, Carroll W. From Conservation to Ecology: The Development of Environmental Concern. New York: Crowell, 1973.
MLA引文Pursell, Carroll W. From Conservation to Ecology: The Development of Environmental Concern. Crowell, 1973.
警告：这些引文格式不一定是100％准确.