White, M. (2009). Complete national parks of the United States: Featuring 400+ parks, monuments, battlefields, historic sites, scenic trails, recreation areas, and seashores. National Geographic.
Chicago-referens (17:e uppl.)White, Mel. Complete National Parks of the United States: Featuring 400+ Parks, Monuments, Battlefields, Historic Sites, Scenic Trails, Recreation Areas, and Seashores. Washington, D.C: National Geographic, 2009.
MLA-referens (9:e uppl.)White, Mel. Complete National Parks of the United States: Featuring 400+ Parks, Monuments, Battlefields, Historic Sites, Scenic Trails, Recreation Areas, and Seashores. National Geographic, 2009.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.