Maiti, Ratikanta. “The Culture of the Highland Valley of Mexico. I. Life Around the Popocatepetl, a Dangerous Volcano (to Continue)”. International Journal of Bio-Resource and Stress Management, vol. 1, no. Sep, 2, Sept. 2010, pp. 121-4, https://www.ojs.pphouse.org/index.php/IJBSM/article/view/70.