APA-referens (7:e uppl.)
Cox, T. R. (1988). The park builders: A history of state parks in the Pacific northwest. University of Washington Press.
Chicago-referens (17:e uppl.)
Cox, Thomas R. The Park Builders: A History of State Parks in the Pacific Northwest. Seattle: University of Washington Press, 1988.
MLA-referens (9:e uppl.)
Cox, Thomas R. The Park Builders: A History of State Parks in the Pacific Northwest. University of Washington Press, 1988.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.