Botanical composition of bison diets on shortgrass plains. American Midland Naturalist. Raunkiaer, C. 1934. The life forms of plants and statistical plant geography. Shiflet, Thomas N., ed.
Rangeland cover types of the United States.
Society for Range Management. Spring burning effects on redberry juniper-mixed grass habitats. Journal of Range Management. Stickney, Peter F. 1989. Seral origin of species originating in northern Rocky Mountain forests.