Belkin, N. J., & Van Rijsbergen, C. J. (1989). Research and development in information retrieval (1989): Proceedings of the 12th Annual International ACM/SIGIR Conference Cambridge, Massachusetts USA, June 25-28, 1989. Association for Computing Machinery.
Παραπομπή σε μορφή Chicago (17η εκδ.)Belkin, Nicholas J., και C. J. Van Rijsbergen. Research and Development in Information Retrieval (1989): Proceedings of the 12th Annual International ACM/SIGIR Conference Cambridge, Massachusetts USA, June 25-28, 1989. New York: Association for Computing Machinery, 1989.
Παραπομπή σε μορφή MLA (8th εκδ.)Belkin, Nicholas J., και C. J. Van Rijsbergen. Research and Development in Information Retrieval (1989): Proceedings of the 12th Annual International ACM/SIGIR Conference Cambridge, Massachusetts USA, June 25-28, 1989. Association for Computing Machinery, 1989.
