Não informado. (2000). University of Colorado studies. University of Colorado Press.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. University of Colorado Studies. Boulder, Colo: University of Colorado Press, 2000.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. University of Colorado Studies. University of Colorado Press, 2000.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.