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North America. Washington, D.C.: National Geographic. p. 362. ISBN 978-0-7922-4175-1. Ridway, R. (1914). "The birds of North and Middle America: A descriptive...

North America. Washington, D.C.: National Geographic. p. 396. ISBN 978-0-7922-4175-1. "All About Birds: Great Crested Flycatcher". Cornell Laboratory of...

North America. Washington, D.C.: National Geographic. p. 105. ISBN 978-0-7922-4175-1. A new subspecies of the double-crested cormorant, Phalacrocorax auritus...

Birds of North America. National Geographic Society. p. 360. ISBN 978-0-7922-4175-1. Pforr, Manfred; Alfred Limbrunner (1982). The Breeding Birds of Europe...