Lopes, L. E., and L. P. Gonzaga. “Morphological Variation in the Cinnamon Tanager Schistochlamys ruficapillus Aves: Thraupidae)”. Zootaxa, vol. 3873, no. 5, Oct. 2014, pp. 477–494, doi:10.11646/zootaxa.3873.5.2.