Koskei, A., P. Cheruiyot, et I. Naibei. « Revenue Collection Efficiency in the County Government of Kericho, Keny »a. East African Journal of Business and Economics, Vol. 1, nᵒ 1, Apr. 2019, p. 9-21, https://www.journals.eanso.org/index.php/eajbe/article/view/6.