APA (7th ed.) Citation

United States. National Park Service. (2006). Lewis and Clark National and State Historical Parks: Lewis and Clark National Historical Park, Oregon/Washington. [National Park Service].

Chicago Style (17th ed.) Citation

United States. National Park Service. Lewis and Clark National and State Historical Parks: Lewis and Clark National Historical Park, Oregon/Washington. [Washington, D.C.]: [National Park Service], 2006.

MLA (9th ed.) Citation

United States. National Park Service. Lewis and Clark National and State Historical Parks: Lewis and Clark National Historical Park, Oregon/Washington. [National Park Service], 2006.