López-Doncel, Rubén. “The Middle Cretaceous Tamabra Formation in the Central Portion of the Valles-San Luis Potosi Platform Western Margin, Central-Northeastern Mexico”. Revista Mexicana De Ciencias Geológicas, vol. 20, no. 1, June 2018, pp. 1-19, https://www.rmcg.unam.mx/index.php/rmcg/article/view/949.