L. M. Ramírez U., Álvaro Botero B., and G. Kattan, “Distribution and abundance of the torrent duck Merganetta armata (aves: anatidae) in the Quindío river, Colombia”, Bol. cient. mus. hist. nat. univ. caldas, vol. 18, no. 2, pp. 172–180, Jul. 2014.