K. David Harrison (2007) When Languages Die: The Extinction of the World's Languages and the Erosion of Human Knowledge, p. 70-72, published by Oxford University Press US, ISBN 0-19-518192-1, 304 pages [1] (页面存档备份,存于互联网档案馆)
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K. David Harrison (2007) When Languages Die: The Extinction of the World's Languages and the Erosion of Human Knowledge, p. 70-72, published by Oxford University Press US, ISBN 0-19-518192-1, 304 pages [1] (页面存档备份,存于互联网档案馆)