Paulsen, Jr. H.A., Ares F.N..  1962.  Grazing values and management of black grama and tobosa grasslands and associated shrub ranges of the Southwest. U.S. Department of Agriculture, Forest Service, Technical Bulletin No. 1270. :56.

Paulsen, Jr. H.A., Ares F.N..  1961.  Trends in carrying capacity and vegetation on an arid Southwestern range. Journal of Range Management. 14:78-83.