1. International Organization for Standardization, Thesauri and Interoperability with Other Vocabularies, ISO 25694,2011
2. Information Retrieval: Data Structures & Algorithms, chap.,1992
3. From thesauri towards ontologies?;Fischer,1998
4. Indexing Languages and Thesauri: Construction and Maintenance;Soergel,1974
5. URBAMET: le thesaurus et les lexiques. D’Urbamet à Urbadisc;Maillard,1998