“Current situation of plastic producing companies in function of environmental preservation and conservation measures in the city of Guayaquil” (2020) Teorías, Enfoques y Aplicaciones en las Ciencias Sociales, 13(27), pp. 76–82. Available at: https://revistas.uclave.org/index.php/teacs/article/view/3051 (Accessed: 8 August 2026).