1 2 Johnson, B.; Lloyd, D. (2008). “Round-leaf cassia.” Pastures Australia. Retrieved 19 November 2013 from "Factsheet - Round-leaf cassia". Archived from the original on 2013-10-17. Retrieved 2013-12-06.
↑ Derpsch, R.; Friedrich, T.; Kassam, A.; Hongwen, L. (2010). “Current status of adoption of no-till farming in the world and some of its main benefits.” International Journal of Agricultural & Biological Engineering 3 (1): 1-26. Retrieved 18 November 2013 from http://www.fao.org/ag/ca/CA-publications/China_IJABE.pdf
↑ Lacefield, G.D.; Henning, J.C.; Rasnake, M.; Collins, M. (1997). “Alfalfa The Queen of Forage Crops”. Kentucky Cooperative Extension Service. Retrieved 18 November 2013 from http://www2.ca.uky.edu/agc/pubs/agr/agr76/agr76.pdf
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