Assignment was based on primary and gray literature (del Hoyo et al. 1992, Cornell Lab of Ornithology 2010, Howell 2012)
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del Hoyo, J., A. Elliot, and J. Sargatal (Editors) (1992). Handbook of the Birds of the World, vol. 1: Ostrich to Ducks. Lynx Edicions, Barcelona, Spain.
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Cornell Lab of Ornithology (2010). Neotropical Birds Online.
http://neotropical.birds.cornell.edu
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Howell, S. N. G. (2012). Petrels, Albatrosses, and Storm-Petrels of North America: A Photographic Guide. Princeton University Press, Princeton, NJ, USA.