KOSGEI , David. Influence of membership to farmer association on maize yields in Bungoma County: A propensity score matching analysis . African Journal of Education,Science and Technology (AJEST), [S. l.], v. 5, n. 2, p. Pg 101–110, 2019. Disponível em: http://ajest.org/index.php/ajest/article/view/121. Acesso em: 3 apr. 2026.