Érika Machado and L. F. Silveira, “ Geographical and seasonal distributions of the seedeaters Sporophila bouvreuil and Sporophila pileata (aves: Emberizidae) ”, Pap. Avulsos Zool., vol. 50, no. 32, pp. 517–533, Jan. 2010, doi: 10.1590/S0031-10492010003200001.