Provedení ISO 639-1: Codes for the representation of names of languages - Part 1: Two-letter codes for languages (2014)

Library of Congress. ISO 639-1: Codes for the representation of names of languages - Part 1: Two-letter codes for languages [online]. Washington (D.C.): The Library of Congress, [cit. 2014-03-18]. Library of Congress Linked Data Service. Authorities and Vocabularies. Dostupné z (URI): http://id.loc.gov/vocabulary/iso639-1 nebo URL: http://id.loc.gov/vocabulary/iso639-1.html.