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Casillas-Orona, Federico Moctezuma (2005): The Imperial Woodpecker, Campephilus imperialis (Gould, 1832). Short paper published online; June, 2005. PDF fulltext

Dalton, Rex (2005): Ornithology: A wing and a prayer. Nature 437(8 September 2005): 188–190. Summary

Gallagher, Tim (2013): Imperial Dreams: Tracking the Imperial Woodpecker Through the Wild Sierra Madre. New York: Atria Books. ISBN 978-1-4391-9152-1.

Tanner, James T. (1964): The Decline and Present Status of the Imperial Woodpecker of Mexico. Auk 81(1): 74–81. PDF fulltext