Firme, D. H., & Raposo, M. A. (2011). Taxonomy and geographic variation of Formicivora serrana (Hellmayr, 1929) and Formicivora littoralis Gonzaga and Pacheco, 1990 (Aves: Passeriformes: Thamnophilidae). Zootaxa, 2742(1), 1–33. https://doi.org/10.11646/zootaxa.2742.1.1