Gordón-M., R., A. González, J. Franco, and E. Rodríguez. “EVALUATION OF BLACK AND RED BEANS (Phaseolus Vulgaris L.) IN AZUERO REGION, PANAMA. 1998.”. Ciencia Agropecuaria, no. 13, Feb. 2003, pp. 29-40, http://200.46.165.126/index.php/ciencia-agropecuaria/article/view/312.