Hanson, H.C. 1955. Characteristics of the Stipa comata-Bouteloua gracilis-Bouteloua curtipendula association in northern Colorado. Ecology. 36(2): 269-280.

Hanson, H.C. 1955. Characteristics of the Stipa comata–Bouteloua gracilis–Bouteloua curtipendula association in northern Colorado. Ecology. 36(2): 269-280.