Züchner, T. and P. F. D. Boesman (2020). Black-backed Thornbill (Ramphomicron dorsale), 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.blbtho1.01 retrieved 23 February 2022