Weber, Reinhard. 2019. “How Old Is the Triassic Flora of Sonora and Tamaulipas and News on Leonardian Floras in Puebla and Hidalgo, Mexico”. Revista Mexicana De Ciencias Geológicas 14 (2):225-43. https://rmcg.geociencias.unam.mx/index.php/rmcg/article/view/1148.