APA (7th ed.) Citation

United States. National Park Service. (1999). Ancient architects of the Mississippi. National Park Service.

Chicago Style (17th ed.) Citation

United States. National Park Service. Ancient Architects of the Mississippi. [Washington, D.C.]: National Park Service, 1999.

MLA (8th ed.) Citation

United States. National Park Service. Ancient Architects of the Mississippi. National Park Service, 1999.

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