Purcell, Larry C.; Salmeron, Montserrat; Ashlock, Lanny (2014). "Chapter 2". Arkansas Soybean Production Handbook - MP197. Little Rock, AR: University of Arkansas Cooperative Extension Service. pp. 1–8. Archived from the original(PDF) on 4 மார்ச் 2016. Retrieved 21 February 2016.
Bennett, J. Michael; Rhetoric, Emeritus; Hicks, Dale R.; Naeve, Seth L.; Bennett, Nancy Bush (2014). The Minnesota Soybean Field Book(PDF). St Paul, MN: University of Minnesota Extension. p. 33. Archived from the original(PDF) on 30 September 2013. Retrieved 16 September 2016.
unimelb.edu.au
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Purcell, Larry C.; Salmeron, Montserrat; Ashlock, Lanny (2014). "Chapter 2". Arkansas Soybean Production Handbook - MP197. Little Rock, AR: University of Arkansas Cooperative Extension Service. pp. 1–8. Archived from the original(PDF) on 4 மார்ச் 2016. Retrieved 21 February 2016.
Bennett, J. Michael; Rhetoric, Emeritus; Hicks, Dale R.; Naeve, Seth L.; Bennett, Nancy Bush (2014). The Minnesota Soybean Field Book(PDF). St Paul, MN: University of Minnesota Extension. p. 33. Archived from the original(PDF) on 30 September 2013. Retrieved 16 September 2016.
