Ormaza-Murillo, María Piedad, et al. “Mental Burden of Teachers of Public Administration of High School Polytechnic Farming of Manabí”. Industrial Engineering (Ingeniería Industrial), vol. 40, no. 1, Dec. 2018, pp. 3-13, https://rii.cujae.edu.cu/index.php/revistaind/article/view/901.