Smith, P., and S. D. Ríos. “Novel Plumage Aberrations in Paraguayan Non-Passerine Birds, and the Definition of a New Plumage Aberration Unique to Psittacidae”. Biodiversity and Natural History, Vol. 3, no. 1, July 2017, pp. 24-28, https://www.biodiversnathist.com/index.php/bnh/article/view/38.