APA (7th ed.) Citation

National Park Foundation. (1990). The Complete guide to America's national parks: The official visitor's guide of the National Park Foundation : information on all 384 of America's National Park areas (1990-1991 ed.). National Park Foundation.

Chicago Style (17th ed.) Citation

National Park Foundation. The Complete Guide to America's National Parks: The Official Visitor's Guide of the National Park Foundation : Information on All 384 of America's National Park Areas. 1990-1991 ed. [Washington, D.C.]: National Park Foundation, 1990.

MLA (9th ed.) Citation

National Park Foundation. The Complete Guide to America's National Parks: The Official Visitor's Guide of the National Park Foundation : Information on All 384 of America's National Park Areas. 1990-1991 ed. National Park Foundation, 1990.