D. M. E. Sánchez, M. Ángel M. López, and E. J. C. Luna, “Perceived Performance on Tutors During Process of Certification in Four Teacher Training Institutions in Durango”, EJMS, vol. 3, no. 2, pp. 22–27, Mar. 2018, doi: 10.26417/ejms.v7i2.p22-27.