Standard ECMA-376: Office Open XML File Formats
- Official text of the OOXML file format as accepted by the Ecma International standards body.
- http://www.ecma-international.org/publications/standards/Ecma-376.htm

Ecma Office Open XML File Formats Overview
- Official details about the format, and links to technical information.
- http://office.microsoft.com/en-us/products/HA102058151033.aspx

PC World: ISO Rejects Microsoft's OOXML as Standard
- Article providing details of the outcome of the recent ISO voting on Microsoft's document format specification.
- http://www.pcworld.com/article/id,136711/article.html

Wikipedia: Office Open XML
- Encylopedia article about the forum, including background, standardization efforts, and controversies.
- http://en.wikipedia.org/wiki/Office_Open_XML