APA (7th ed.) Citation

United States. National Park Service. (1992). 3rd grade: Adaptation in nature]. [National Park Service].

Chicago Style (17th ed.) Citation

United States. National Park Service. 3rd Grade: Adaptation in Nature]. [Washington, D.C.?]: [National Park Service], 1992.

MLA (8th ed.) Citation

United States. National Park Service. 3rd Grade: Adaptation in Nature]. [National Park Service], 1992.

Warning: These citations may not always be 100% accurate.