Não informado. (2000). University of Colorado studies. University of Colorado Press.
Chicago-referens (17:e uppl.)Não informado. University of Colorado Studies. Boulder, Colo: University of Colorado Press, 2000.
MLA-referens (8:e uppl.)Não informado. University of Colorado Studies. University of Colorado Press, 2000.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.