Cita APA (7a ed.)

Department of the Interior. National Park Service. (1941). A study of the park and recreation problem of the United States. Government Printing.

Cita Chicago Style (17a ed.)

Department of the Interior. National Park Service. A Study of the Park and Recreation Problem of the United States. Washington: Government Printing, 1941.

Cita MLA (9a ed.)

Department of the Interior. National Park Service. A Study of the Park and Recreation Problem of the United States. Government Printing, 1941.