Muchiri, P., F. Karanja, W. Ogara, and J. Maweu. “Analysis of Historical Rainfall Variability, Droughts and Wet Seasons. A Case of Wiyumiririe Laikipia County”. Journal of Sustainability, Environment and Peace, Vol. 3, no. 1, Feb. 2020, pp. 15-20, https://uonjournals.uonbi.ac.ke/ojs/index.php/jsep/article/view/267.