ISO 639-2: Codes for the representation of names of languages -- Part 2: Alpha-3 code
The code set is available from http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=4767
iso639-2_iso639-2
http://purl.bioontology.org/ontology/HL7/iso639-2_iso639-2