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MLA

Wilson, Louis F, United States, and Forest Service. "Pine Spittlebug : Its Ecology and Management." , 18. Print

APA

Wilson, L. F, United States, U. States, & Forest Service, F. Service. (1991). Pine spittlebug : its ecology and management.

Chicago

Wilson, Louis F., United States, and Forest Service. "Pine spittlebug : its ecology and management" (1991): 18.