Bille, Thomas. “Eggs and Hatchlings of the Mexican Salamander Pseudoeurycea Cephalica (Caudata: Plethodontidae)”. Revista de Biología Tropical 46, no. 2 (June 1, 1998): 447–452. Accessed June 6, 2025. https://revistas.ucr.ac.cr/index.php/rbt/article/view/19694.