Zimmer, K. and M.L. Isler (2020). Sooty Antbird (Hafferia fortis), 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.sooant1.01 retrieved August 20, 2024
Cerón-Cardona, Juliana; Londoño, Gustavo A. (2017). "Nesting Biology of the Sooty Antibird[sic] (Hafferia fortis) in Southeastern Peru". Wilson Journal of Ornithology. 129 (3): 576–585. doi:10.1676/16-020.1. S2CID90550490.
Cerón-Cardona, Juliana; Londoño, Gustavo A. (2017). "Nesting Biology of the Sooty Antibird[sic] (Hafferia fortis) in Southeastern Peru". Wilson Journal of Ornithology. 129 (3): 576–585. doi:10.1676/16-020.1. S2CID90550490.