Navas-Parejo, Pilar. “Carboniferous Biostratigraphy of Sonora: A Review”. Revista Mexicana de Ciencias Geológicas 35, no. 1 (March 21, 2018): 41–53. Accessed May 24, 2025. https://www.rmcg.unam.mx/index.php/rmcg/article/view/571.