Willis, Edwin O. “Behavior and Ecology of Two Forms of White-Chinned Woodcreepers (Dendrocincla Merula, Dendrocolaptidae) in Amazonia”. Papéis Avulsos De Zoologia, vol. 33, no. 1-25 (1979-1980), July 1979, pp. 27-66, https://doi.org/10.11606/0031-1049.1979.33.p27-66.