Bums, John R, and Miguel A Ramirez. 1990. “Annual Pattern of Reproduction of the Bagre, <i>Arius guatemalensis</i≫ (Pisces: Ariid”. Revista De Biología Tropical 38 (2B):487–490. https://revistas.ucr.ac.cr/index.php/rbt/article/view/25672.