ИСТОЧНИК: “The World Atlas of Language Structures” . , Bernard Comrie and David Gil and Martin Haspelmath and Matthew S. Dryer · Oxford University Press

ИСТОЧНИК: “California Indian Languages” (61-200) . Victor Golla (2011) University of California Press

ИСТОЧНИК: “North America” (7-41) . Victor Golla and Ives Goddard and Lyle Campbell and Marianne Mithun and Mauricio Mixco (2008) , Chris Moseley and Ron Asher · Routledge

ИСТОЧНИК: “Encyclopedia of the World's Endangered Languages” . Christopher Moseley (2007) Routledge