Sphyrapicus varius (Italian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Sphyrapicus varius" in Italian language version.

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Winkler H., Christie D., Nurney D., Woodpeckers. A Guide to Woodpeckers, Piculets and Wrynecks of the World, Pica Press, Robertsbridge, 1995, p. 68−69/220−222, ISBN 0-395-72043-5.
Bent, A., Life Histories of the North American Woodpeckers, Indiana University Press, 1992.
Short, L., Woodpeckers of the World, Foris Publication, 1982.