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{{cite journal|author=Marler, P., & M. Tamura|year= 1962|title=Song dialects in three populations of the white-crowned sparrow|journal= Condor |volume=64|issue=5|pages=368–377|doi=10.2307/1365545|jstor=1365545}}</ref>
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{{cite journal||last=Sober|first=Samuel J|last2=Brainard|first2=Michael S|title=Adult birdsong is actively maintained by error correction|journal=Nature Neuroscience|volume=12|issue=7|date=14. Junejuni 2009 |pages=927-931 |doi=10.1038/nn.2336|accessdate=19-09-2013}}</ref>
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{{cite web |url=http://www.oiseaux.net/dossiers/gilbert.blaising/chanter.est.indispensable.html|title=Pour les oiseaux, chanter est indispensable|author=Gilbert Blaising|publisher=oiseau.net|language=fransk}}</ref>.