del Hoyo J., Elliott A., Sargatal J., Christie D.A. & de Juana E. (eds.).: Handbook of the Birds of the World (HBW) Alive [https://www.hbw.com/], Lynx Edicions, Barcelona [as Picumnus nigropunctatus J. T. Zimmer and Phelps, Sr, 1950] Data retrieved on: 28 November 2018
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