1. EPA. (2020). Inventory of US greenhouse gas emissions and sinks. United States Environmental Protection Agency. EPA 430-R-19-001.
2. Graham, C.J., H.M. van Es, J.J. Melkonian, D.A. Laird. 2010. Improved nitrogen and energy use efficiency using NIR estimated soil organic carbon and N simulation modeling. In: D.A. Clay J. Shanahan. GIS applications in agriculture – Nutrient Management for Improved Energy Efficiency. pp. 301–325, Taylor and Francis, LLC.
3. Version 4. Res. Ser. R03–1;JL Hutson,2010
4. Marjerison, Melkonian, R. D. J., Hutson, J. L., van Es, H. M., Sela, S., Geohring, L. D., & Vetsch, J. (2016). Drainage and nitrate leaching from artificially drained maize fields simulated by the Precision Nitrogen Management model. Journal of Environmental Quality, 45, 2044–2052.
5. McLellan, E. L., Cassman, K. G., Woodbury, P. B., Sela, S., Eagle, A. J., Tonitto, C., Marjerison, R. D., & van Es, H. M. (2018). The nitrogen balancing act: Tracking the environmental performance of food supply chains. Bioscience, 68(3), 194–203.