The Atlas of languages : the origin and development of languages throughout the world. New York 2003, Facts On File. p. 40. Stephen A. Wurm, Atlas of the
Stephen Matthews, Maria Polinsky, eds. (2003) The Atlas of languages : the origin and development of languages throughout the world. New York: Facts On File
language, Wurm, Stephen A.; Mühlhäusler, Peter; Tyron, Darrell T. (编), Atlas of languages of intercultural communication in the Pacific, Asia, and the Americas