1. Ashlock, L., 1999. Arkansas soybean handbook. Miscellaneous Publiaction 197. University of Arkansas Cooperative Extension Service, Little Rock.
2. Optimizing soybean plant population for a short-season poduction system in the southern USA;Ball;Crop Sci.,2000
3. Short-season soybean yield compensation in response to population and water regime;Ball;Crop Sci.,2000
4. The Economics of Production;Beattie,1985
5. Bryant, K.J., Tacker, P., Vories, E.D., Windham, T., Stiles, S., 2001. Estimating irrigation costs. Publication FSA28. University of Arkansas Cooperative Extension Service, Little Rock.