Bums, J. R., and M. A. Ramirez. “Annual Pattern of Reproduction of the Bagre, <i>Arius guatemalensis</i≫ (Pisces: Ariid”. Revista De Biología Tropical, vol. 38, no. 2B, Nov. 1990, pp. 487–490, https://revistas.ucr.ac.cr/index.php/rbt/article/view/25672.