Rujukan
- "ISO 639-2 Registration Authority". Library of Congress.
- "ISO 639-3 Registration Authority". SIL International.
- Lewis, M. Paul; Simons, Gary F.; Fennig, Charles D., penyunting (2016). "Ethnologue: Languages of the World" (ed. 19th). Dallas, Texas: SIL International.
Pautan luar
- "Codes for the Representation of Names of Languages (ISO 639-1 and ISO 639-2 codes)". Library of Congress.
- "ISO 639-3 Downloads". SIL International.
