Ndimbo, M. A, S Nchimbi-Msolla, and E Semu. 2015. “Effects of Moisture Stress Levels at Different Growth Stages on Nodulation and Nitrogen Fixation in Common Bean (Phaseolus Vulgaris L.) Genotype”. Asian Journal of Agriculture and Rural Development 5 (8):187-201. https://archive.aessweb.com/index.php/5005/article/view/1398.