Cita APA (7a ed.)

Mackintosh, B. (1989). The United States Park Police. History Div., National Park Service, Dep. of the Interior.

Cita Chicago Style (17a ed.)

Mackintosh, Barry. The United States Park Police. Washington, DC: History Div., National Park Service, Dep. of the Interior, 1989.

Cita MLA (9a ed.)

Mackintosh, Barry. The United States Park Police. History Div., National Park Service, Dep. of the Interior, 1989.