Lucas, E., K. Ogedengbe, and T. Abegunrin. “GUTTERING SYSTEM DESIGN FOR RAINWATER HARVESTING APPLICABLE FOR IBADAN METROPOLIS, NIGERIA”. LAUTECH Journal of Engineering and Technology, Vol. 3, no. 2, Feb. 2005, pp. 93-98, https://laujet.com/index.php/laujet/article/view/206.