Penutian (Scott DeLancey's site). darkwing.uoregon.edu. [zarchiwizowane z tego adresu (2005-04-11)].
Bibliography of comparative Penutian. darkwing.uoregon.edu. [zarchiwizowane z tego adresu (2005-03-16)].
The Bipartite Stem Belt: Disentangling Areal and Genetic Correspondences. darkwing.uoregon.edu. [zarchiwizowane z tego adresu (2005-10-01)].
Ethnologue: Penutian
List of proposed Penutian languages in Oregon. logos.uoregon.edu. [zarchiwizowane z tego adresu (2005-04-06)].
Native Tribes, Groups, Language Families and Dialects of California in 1770. californiaprehistory.com. [zarchiwizowane z tego adresu (2011-04-30)]. (map after Kroeber)
Mitochondrial DNA and Prehistoric Settlements: Native Migrations on the Western Edge of North America. findarticles.com. [zarchiwizowane z tego adresu (2008-01-23)].