“Current situation of plastic producing companies in function of environmental preservation and conservation measures in the city of Guayaquil”, Teor. Enfoques. Apl. Cienc. Soc., vol. 13, no. 27, pp. 76–82, Dec. 2020, Accessed: Jul. 24, 2026. Available: https://revistas2.uclave.org/index.php/teacs/article/view/3051