Mburu, M.W, L Simmonds, and C Pilbeam. “Bean Canopy Response to Irrigation, Nitrogen Fertiliser and Planting”. East African Agricultural and Forestry Journal 65, no. 1&2 (September 15, 2008). Accessed September 27, 2022. https://www.kalro.org/www.eaafj.or.ke/index.php/path/article/view/156.