Galwab, A. M., and P. P. Kamau. “EFFECT OF WATER HARVESTING TECHNIQUES ON GRAIN YIELD AND ABOVE GROUND BIOMASS OF COWPEA”. International Journal of Agriculture, vol. 2, no. 1, July 2017, pp. 58-76, https://www.iprjb.org/journals/index.php/IJA/article/view/429.