García, P. J. J., J. C. G. Delgado, L. R. Llanes, F. M. Fernandez, and E. V. B. Pando. “Locus of Control in Mexican University Students Comparisons by Gender”. European Scientific Journal, ESJ, Vol. 13, no. 2, Jan. 2017, p. 235, doi:10.19044/esj.2017.v13n2p235.