Firme, D. H.; Raposo, M. A. Taxonomy and Geographic Variation of Formicivora Serrana (Hellmayr, 1929) and Formicivora Littoralis Gonzaga and Pacheco, 1990 (Aves: Passeriformes: Thamnophilidae). Zootaxa 2011, 2742, 1–33.