Blume, Dieter; Winkler, Hans (2003), "Woodpeckers", in Christopher Perrins (editor), Firefly Encyclopedia of Birds, Firefly Books, pp. 408–413, ISBN 1-55297-777-3
Winkler, Hans; Christie, David A. (2002), "Family Picidae", in del Hoyo, J., Elliott, A. and Sargatal, J. (editors), Handbook of the Birds of the World, Volume 7: Jacamars to Woodpeckers, Barcelona: Lynx Edicions, pp. 280–555, ISBN 84-87334-37-7