S. Hernández-Vázquez and G. Fernández-Acevez, “Reproduction of Cochlearius cochlearius (boat-billed heron) and Butorides virescens (green-backed heron) in La Manzanilla, Jalisco, Mexico”, Cienc. Mar., vol. 25, no. 2, pp. 277–291, Mar. 1999.