Monnerat Nogueira, D. and Alice S. Alves, M. (2008) “Iris colour as an indicator of age feature in female Brazilian tanagers (Passeriformes: Emberizidae) confirmed by a molecular sexing technique”, Revista de Biología Tropical, 56(4), pp. 1629–1633. doi: 10.15517/rbt.v56i4.5749.