Richardson, M. L., Clemmons, S. D., & Walker, J. C. (1979). Soil survey of Santa Cruz and parts of Cochise and Pima Counties, Arizona. Dept. of Agriculture, Soil Conservation Service.
Chicago Style (17th ed.) CitationRichardson, M. L., S. D. Clemmons, and J. C. Walker. Soil Survey of Santa Cruz and Parts of Cochise and Pima Counties, Arizona. [Washington]: Dept. of Agriculture, Soil Conservation Service, 1979.
MLA (9th ed.) CitationRichardson, M. L., et al. Soil Survey of Santa Cruz and Parts of Cochise and Pima Counties, Arizona. Dept. of Agriculture, Soil Conservation Service, 1979.
Warning: These citations may not always be 100% accurate.