Dry Tortugas National Park.
APA Citation
United States. National Park Service. (1998). Dry Tortugas National Park. [Washington, D.C.: U.S. Dept. of the Interior, National Park Service?.
MLA Citation
United States. National Park Service. Dry Tortugas National Park. [Washington, D.C.: U.S. Dept. of the Interior, National Park Service?, 1998.
Warning: These citations may not always be complete (especially for serials).