1. Nongrowing season evaporation in Northern Utah;Allen,1996
2. Allen, R.G., Pereira, L.S., Raes, D., Smith, M., 1998. Crop Evapotranspiration. Guidelines for Computing Crop Water Requirements. FAO Irrigation and Drainage Paper No. 56. Food and Agriculture Organization of the United Nations, Rome, Italy.
3. American Meteorological Society, 2000. Glossary of Meteorology, 2nd ed. Boston, MA.
4. Antle, M., Roth, G.W., Johnson D.H., 2005. 2005 Pennsylvania soybean performance report. Available on line at: http://cornandsoybeans.psu.edu/pdfs/2005soybeanperformancereport.pdf (verified on 17.12.11).
5. Ewald Wollny – a pioneer in soil and water conservation research;Baver;Proceedings – Soil Science Society of America,1938