References Treccani.itTreccani.it: Enciclopedia, Vocabolario
(voce: Englog); ; ; ETHNEthnologue. Languages of the world, M. Paul Lewis, Gary F. Simons, Charles D. Fennig (eds.), 24th. ed., Dallas, Tex., SIL International
; GLOTTGlottolog, vers. 4.1 edited by R. Forkel, H. Hammarström, M. Haspelmath
; Wikipedia(IT)Wikipedia. L'enciclopedia libera, 2001 [ed. in lingua italiana dell' enciclopedia online Wikipedia]
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