A. Sotil Brioso, L. M. Escurra Mayaute, R. E. Huerta Rosales, E. Campos Pacheco, Z. J. Yana Jahuira, and D. Macazana Fernandez, “Attitudes of teachers towards teaching in values to students of elementary school”, Rev. Investig. Psicol., vol. 8, no. 1, pp. 107–120, Jun. 2005, doi: 10.15381/rinvp.v8i1.4236.