Velazco, D. J. M., E. M. F. Hinostroza, M. F. C. Martínez, and E. J. Liccione. “MATHEMATICS ANXIETY AND ITS EFFECTS ON ENGINEERING STUDENTS’ PERFORMANCE DURING THE COVID 19 PANDEMIC”. Journal on Mathematics Education, vol. 12, no. 3, Sept. 2021, pp. 547-62, http://jme.ejournal.unsri.ac.id/index.php/jme/article/view/3651.