Heynen, I. and G. M. Kirwan (2020). Blue-capped Puffleg (Eriocnemis glaucopoides), 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.blcpuf1.01 retrieved March 15, 2022