Gordon, R.G., Jr. (2005). Ethnologue: Languages of the World, 15th edition. (Dallas, TX: SIL International). Online version Archived copy. [2009-11-12]. (原始内容存档于2016-11-07). (页面存档备份,存于互联网档案馆)
Gordon, R.G., Jr. (2005). Ethnologue: Languages of the World, 15th edition. (Dallas, TX: SIL International). Online version Archived copy. [2009-11-12]. (原始内容存档于2016-11-07). (页面存档备份,存于互联网档案馆)