↑ Anastasia M,Griffin(2008)(英語).Georg Friederici's (1906) "Scalping and Similar Warfare Customs in America" with a Critical Introduction.ProQuest.p.18.ISBN9780549562092
↑ Mensforth, Robert P.;Chacon, Richard J. Chacon;Dye, David H.(2007年).“Human Trophy Taking in Eastern North America During the Archaic Period: The Relationship to Warfare and Social Complexity”(英語).The Taking and Displaying of Human Body Parts as Trophies by Amerindians(Springer Science + Business Media): p.225{{cite news}}: 名無し引数「洋書」は無視されます。 (説明)⚠