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Loynachan, Tom (1 December 2016). "Nitrogen Fixation by Forage Legumes"(PDF). Iowa State University. Department of Agrology. Archived from the original(PDF) on 3 May 2013. Retrieved 1 December 2016.
Davies, Ken (March 2007). "Weed Control in Potatoes"(PDF). British Potato Council. Archived(PDF) from the original on 19 October 2016. Retrieved 1 December 2016.
"Forages in Rotation"(PDF). Saskatchewan Soil Conservation Association. 2016. Archived(PDF) from the original on 2 December 2016. Retrieved 1 December 2016.
Carroll, C.; Halpin, M; Burger, P.; Bell, K.; Sallaway, M. M.; Yule, D. F. (1997). "The effect of crop type, crop rotation, and tillage practice on runoff and soil loss on a Vertisol in central Queensland". Soil Research. 35 (4): 925. doi:10.1071/S96017. ISSN1838-675X.