Gastañaduy, Alfonso. “Mercadeo Informal Estrategia De Pequeña Empresa La Necesidad Obliga”. Journal of Economics, Finance and Administrative Science 1, no. 1 (March 30, 1992): 111–121. Accessed November 22, 2024. https://revistas.esan.edu.pe/index.php/jefas/article/view/378.