Knowledge Organization Systems (KOS) is a generic term used in knowledge organization about authority files, classification schemes, thesauri, topic maps, ontologies etc.
Hodge, G. (2000). Systems of Knowledge Organization for Digital libraries. Beyond traditional authority files. Washington, DC: the Council on Library and Information Resources. http://www.clir.org/pubs/reports/pub91/contents.html
Garshol, L M (2004) Metadata? Thesauri? Taxonomies? Topic maps! Making sense of it all. Journal of Information Science, 30 (4). 378-391. Online tilgængelig: http://www.ontopia.net/topicmaps/materials/tm-vs-thesauri.html
Tudhope, D. & Lykke Nielsen, M. (2006). Introduction to special issue: Knowledge Organization Systems and Services. New Review of Hypermedia and Multimedia, 12(1), 3-9. http://www.journalsonline.tandf.co.uk/media/m35eac0c7l6wvk510nr7/contributions/r/0/7/7/r077564631920800.pdf
Zeng, M. L. & Chan, L. M. (2004). Trends and issues in establishing interoperability among knowledge organization systems. Journal for the American Society for Information Science and Technology, 55(5), 377-395.
Networked Knowledge Organization Systems/Services NKOS: http://nkos.slis.kent.edu/