Hanks, J., Ritchie, J. T., Mickelson, S. H., Stuber, C. W., & Luxmoore, R. J. (1991). Modeling plant and soil systems. Wisconsin, Estados Unidos: American Society of Agronomy, Inc. ; Crop Science Society of America, Inc. ; Soil Science Society of America, Inc..

Hanks, John,, J. T. Ritchie, S. H. Mickelson, C. W. Stuber, and R. J. Luxmoore. Modeling Plant and Soil Systems. Wisconsin, Estados Unidos: American Society of Agronomy, Inc. ; Crop Science Society of America, Inc. ; Soil Science Society of America, Inc., 1991.

Hanks, John,, et al. Modeling Plant and Soil Systems. Wisconsin, Estados Unidos: American Society of Agronomy, Inc. ; Crop Science Society of America, Inc. ; Soil Science Society of America, Inc., 1991.