Silva-Mora, Luis. “Volcanic Geology and Preliminary Chemical Character of the Rocks of the Tula-Polotitlán Region, States of Hidalgo, Mexico and Querétaro, México”. Revista Mexicana de Ciencias Geológicas 14, no. 1 (January 2, 2019): 50–77. Accessed March 11, 2025. https://rmcg.geociencias.unam.mx/index.php/rmcg/article/view/1126.