Access national parks :
a guide for handicapped visitors.

APA Citation

United States. National Park Service. (1977). Access national parks: a guide for handicapped visitors. Washington: National Park Service, U.S. Dept. of the Interior.

MLA Citation

United States. National Park Service. Access National Parks: a Guide for Handicapped Visitors. Washington: National Park Service, U.S. Dept. of the Interior, 1977.

Warning: These citations may not always be complete (especially for serials).