1. Billhardt, H., Borrajo, D., & Maojo, V. (2000). Using term co-occurrence data for document indexing and retrieval. In Proceedings of BCSIRSG 22nd annual colloquium on information retrieval research (pp. 105–117).
2. Online information retrieval: An introductory manual to principles and practice;Convey,1992
3. Daher, W. (2002). An Arabic auto-indexing system. M.S. Project Report, Lebanese American University.
4. New Arabic grammar;Deeb,1971
5. Franz, M., & Roukos, S. (1998). Auto-indexing for broadcast news. In Proceedings of 7th text retrieval conference (pp. 115–120).