The following bibliography has been generated by bringing together all references provided by our content partners. There may be duplication.
- L. D. Harris and L. Paur, A quantitative food web analysis of a shortgrass community, Technical Report No. 154, Grassland Biome. U.S. International Biological Program (1972), from p. 17.
- USDA, NRCS. 2007. The PLANTS Database (http://plants.usda.gov). National Plant Data Center, Baton Rouge. http://www.tropicos.org/Reference/100004579