W3C
- HTML 4.01 specification, D. Raggett, A. Le Hors, I. Jacobs., 24 December 1999
- XHTML 1.0: The Extensible HyperText Markup Language, Steven Pemberton, et al., 26 January 2000
- Modularization of XHTML, Murray Altheim, et al., 10 April 2001
- Extensible Markup Language (XML) 1.0 (Second Edition), Tim Bray, Jean Paoli, C. M. Sperberg-McQueen, Eve Maler, 6 October 2000.
- XHTML Basic, Mark Baker, et al., 3 November 2000
Other sources
- Why care about standards?, Patrice Neff, 16 July 2001