Aveiga Ortiz, Ana María, Patricio Noles, Aida de la Cruz, Fabián Peñarrieta, and Francisco Alcántara. 2019. “Variations of the Water Quality of the Carrizal River in Manabi”. Enfoque UTE 10 (3):pp. 30 - 41. https://doi.org/10.29019/enfoque.v10n3.423.