Jelaskan Lihat pula dari Pelatuk raja

Lammertink, M.; Rojas-Tomé, J.A.; Casillas-Orona, F.M. & Otto, R.L. (1996): Status and conservation of old-growth forests and endemic birds in the pine-oak zone of the Sierra Madre Occidental, Mexico. Verslagen en Technische Gegevens Instituut voor Systematiek en Populatiebiologie (Zoologisch Museum) 69: 1-89. HTML fulltext

Mendenhall, Matt (2005): Old Friend Missing. Birder's World 2005(6): 35-39. HTML fulltext

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