Berdut, I. R., O. H. Basulto, J. Zivanai, P. R. Gueton, and N. Tunjera. “Learning Contracts to Assess and Evaluate Diverse Classrooms at Teaching Institutions: A Study Made in Cuba and”. The International Journal of Humanities & Social Studies, vol. 2, no. 10, Oct. 2014, https://internationaljournalcorner.com/index.php/theijhss/article/view/140715.