Ethnologue : languages of the world
MLA
Ethnologue: Languages of the World. Dallas, TX: SIL International, 2013-
APA, 7th edition
(2013-). Ethnologue: languages of the world. Dallas, TX: SIL International
Chicago, 17th edition
Ethnologue: languages of the world. Dallas, TX: SIL International, 2013-