Heynen, I. and P. F. D. Boesman (2020). Coppery-bellied Puffleg (Eriocnemis cupreoventris), version 1.0. In Birds of the World (J. del Hoyo, A. Elliott, J. Sargatal, D. A. Christie, and E. de Juana, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.cobpuf1.01 retrieved March 14, 2022