International Conference on Flexible Query Answering Systems & Larsen, H. L. (2001). Flexible query answering systems: Recent advances : proceedings of the Fourth International Conference on Flexible Query Answering Systems, FQAS'2000, October 25-28, 2000, Warsaw, Poland. Springer.
Παραπομπή σε μορφή Chicago (17η εκδ.)International Conference on Flexible Query Answering Systems και Henrik Legind Larsen. Flexible Query Answering Systems: Recent Advances : Proceedings of the Fourth International Conference on Flexible Query Answering Systems, FQAS'2000, October 25-28, 2000, Warsaw, Poland. Heidelberg: Springer, 2001.
Παραπομπή σε μορφή MLA (9th εκδ.)International Conference on Flexible Query Answering Systems και Henrik Legind Larsen. Flexible Query Answering Systems: Recent Advances : Proceedings of the Fourth International Conference on Flexible Query Answering Systems, FQAS'2000, October 25-28, 2000, Warsaw, Poland. Springer, 2001.