- International Organization for Standardization (ISO) — see http://www.iso.org
- ISO 639-1:2002 Codes for the representation of names of languages — Part 1: Alpha-2 code
- ISO 639-2:1998 Codes for the representation of names of languages — Part 2: Alpha-3 code
- ISO 639-3:2007 Codes for the representation of names of languages — Part 3: Alpha-3 code
- ISO 3166-1:2006 Codes for the representation of names of countries and their subdivisions — Part 1: Country codes
- IANA Document: Language Subtag Registry
- BCP 47: Tags for Identifying Languages
- RFC 5646: Tags for Identifying
- ISDCF Document: Digital Cinema Language Codes
- ISCI (Industry Standard Commercial Identifier) codes are assigned and maintained by the American Association of Advertising Agencies — see http://www.aaaa.org
- SMPTE Standard 428-12-2013: D-Cinema Distribution Master Common Audio Channels and Soundfield Groups
- SMPTE Standard 429-7-2006: D-Cinema Packaging — Composition Playlist
- SMPTE Standard 429-10-2008: D-Cinema Packaging — Stereoscopic Picture Track File
- SMPTE Standard 429-12-2008: D-Cinema Packaging — Caption and Closed Subtitle
- SMPTE Standard 429-16-2014: Additional Composition Metadata and Guidelines
- MovieLabs Common Metadata Ratings