Altamirano Hernández, Melina, and Sandra Ley Gutierrez. “The Economy, Security, and Corruption in the 2018 Presidential Election Campaign Issues and Electoral Preferences in Mexico”. Política Y Gobierno, vol. 27, no. 2, Sept. 2020, http://www.politicaygobierno.cide.edu/index.php/pyg/article/view/1275.