1. ANSI/NISO Z39.19-2005. Guidelines for the construction, format, and management of monolingual controlled vocabularies. Bethesda: NISO Press, 2005. http://bit.ly/gUHNL http://www.niso.org/kst/reports/standards
2. Arano, Silvia. "Los tesauros y las ontologías en la biblioteconomía y la documentación". Hipertext.net, 3, 2005. http://www.upf.edu/hipertextnet/numero-3/tesauros.html
3. Thesaurus construction through knowledge representation;Sean Bechhofer;Data & knowledge engineering,2001
4. The semantic web;Tim Berners-Lee;Scientific American,2001