Simmonds, L, M.W Mburu, and C Pilbeam. “Bean Growth and Yield Response to Irrigation, Nitrogen Fertiliser,”. East African Agricultural and Forestry Journal 65, no. 1&2 (September 15, 2008). Accessed May 28, 2022. https://www.kalro.org/www.eaafj.or.ke/index.php/path/article/view/157.