Sasa, Mahmood. “Morphological Variation in the Lancehead Pitviper <i>Bothrops asper</i≫ (Garman) (Serpentes: Viperidae) from Middle America”. Revista de Biología Tropical 50, no. 1 (March 1, 2002): 259–271. Accessed November 25, 2024. https://revistas.ucr.ac.cr/index.php/rbt/article/view/16280.