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MLA

Houston, David R, United States, and Forest Service. "Understanding the Game of the Environment : an Illustrated Guide to Understanding Ecological Principles." , 174. Print

APA

Houston, D. R, United States, U. States, & Forest Service, F. Service. (1979). Understanding the game of the environment : an illustrated guide to understanding ecological principles.

Chicago

Houston, David R., United States, and Forest Service. "Understanding the game of the environment : an illustrated guide to understanding ecological principles" (0000): 174.