Weber, W. A., & Wittmann, R. C. (2012). Colorado flora: A field guide to the vascular plants (4th ed.). University Press of Colorado.
Lua i Stíl Chicago (17ú heag.)Weber, William A., agus Ronald C. Wittmann. Colorado Flora: A Field Guide to the Vascular Plants. 4th ed. Boulder, Colo.: University Press of Colorado, 2012.
Lua MLA (9ú heag.)Weber, William A., agus Ronald C. Wittmann. Colorado Flora: A Field Guide to the Vascular Plants. 4th ed. University Press of Colorado, 2012.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.