APA (7th ed.) Citation

Mackintosh, B. (1991). The national parks: Shaping the system (Rev. ed.). U.S. Dept. of the Interior.

Chicago Style (17th ed.) Citation

Mackintosh, Barry. The National Parks: Shaping the System. Rev. ed. Washington, D.C.: U.S. Dept. of the Interior, 1991.

MLA (9th ed.) Citation

Mackintosh, Barry. The National Parks: Shaping the System. Rev. ed. U.S. Dept. of the Interior, 1991.