Ayala-García, B., Fuentes-Farías, A. L. and Gutiérrez-Ospina, G. (2020) “Phenotypic variation in American bullfrogs (<em>Lithobates catesbeianus</em>) bred under intensive systems in Mexico: A preliminary report”, Veterinaria México OA, 7(1). doi: 10.22201/fmvz.24486760e.2020.1.747.