(en) Stephen N. Ngigia, Hubert H.G. Savenije, Josephine N. Thome, Johan Rockströmb et F.W.T. Penningde Vries, « Agro-hydrological evaluation of on-farm rainwater storage systems for supplemental irrigation in Laikipia district, Kenya », Agricultural Water Management, vol. 73, no 1, , p. 21-41 (DOI10.1016/j.agwat.2004.09.021)