Reference: Eberhard et al. (eds.) 2023

Eberhard, David M., Gary F. Simons & Charles D. Fennig (eds.) 2023. Ethnologue: Languages of the World. Twenty-sixth edition. Dallas, Texas: SIL International.

http://www.ethnologue.com

@book{ethnologue,
  address   = {Dallas, Texas},
  editor    = {Eberhard, David M. and Gary F. Simons and Charles D. Fennig},
  publisher = {SIL International},
  title     = {Ethnologue: Languages of the World. Twenty-sixth edition},
  url       = {http://www.ethnologue.com},
  year      = {2023}
}