حوالہ
- Mikael Parkvall, "Världens 100 största språk 2007" (The World's 100 Largest Languages in 2007), in Nationalencyklopedin
- Ernst Kausen, 2006. Die Klassifikation der indogermanischen Sprachen (Microsoft Word, 133 KB)
- Dwyer 1995, p. 5
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