Ethnologue: Languages of the World. Simons, G. F. & Fenning, C. D., editors SIL International, 20 edition, 2017.
bibtex   
@book{simons_ethnologue:_2017,
	edition = {20},
	title = {Ethnologue: {Languages} of the {World}},
	publisher = {SIL International},
	editor = {Simons, Gary F. and Fenning, Charles D.},
	year = {2017}
}

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