Butcher, G. S.; Niven, D. K. 2007. Combining data from the Christmas bird count and the breeding bird survey to determine the continental status and trends of North American birds.
del Hoyo, J.; Elliot, A.; Sargatal, J. 1992. Handbook of the Birds of the World, Vol. 1: Ostrich to Ducks. Lynx Edicions, Barcelona, Spain.
Hatch, J. 1995. Changing Populations of Double-Crested Cormorants. Colonial Waterbirds 18, Special Publication 1: The Double-Crested Cormorant: Biology, Conservation and Management: 8-24.
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BirdLife International (2020) Species factsheet: Nannopterum auritus. Downloaded from http://www.birdlife.org on 26/02/2020. Recommended citation for factsheets for more than one species: BirdLife International (2020) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 26/02/2020.