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* Gill, B. J. (2003): Osteometry and 1: 43-58. (HTML abstract) {{DOI|10.1017/S1477201903001019}}
* {{cite book|ref=idGoodwin1983|author=Goodwin, D.|title=Crows of the World|isbn=0-7022-1015-3|year=1983|publisher=Queensland University Press}}
* {{cite book|ref=idHeinrich1991|author=Heinrich, Bernd|title=Ravens in Winter|url=https://archive.org/details/ravensinwinter0000hein|isbn=0-679-73236-5|year=1991|publisher=Vintage Press}}
* {{cite book|ref=idHeinrich1999|author=Heinrich, Bernd|title=Mind of the Raven: Investigations and Adventures with Wolf-Birds|isbn=978-0-06-093063-9|year=1999|publisher=Cliff Street Books}}
* {{cite book|ref=idKilham1991|author=Kilham, Lawrence|title=The American Crow and the Common Raven|isbn=0-89096-466-1|year=1991|publisher=Texas A&M University Press}}
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