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Kushlan, James A.; Hancock, James A.; Pinowski, J.; Pinowska, B.. Behavior of Whistling and Capped Herons in the Seasonal Savannas of Venezuela and Argentina. „The Condor”. 84 (3), s. 255–260, 1982. DOI: 10.2307/1367367. JSTOR: 1367367. (ang.).
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Remsen, J.V., Jr.; C.D. Cadena; A. Jaramillo; M. Nores; J.F. Pacheco; M.B. Robbins; T.S. Schulenberg; F.G. Stiles; D.F. Stotz; K.J. Zimmer: A classification of the bird species of South America. South American Classification Committee. American Ornithologists' Union. [zarchiwizowane z tego adresu (2010-11-20)]. (ang.).