Association of Independent Information Professionals : an international association of owners of information businesses. http://www.aiip.org (2002-09-15) Information delivery in the 21st century : proceedings of the Fourth International Conference on Fee-Based Information Services in Libraries / ed. by Suzanne M. Ward (et al.). New York Haworth Press, 1999. Start your own information broker service. New Jersey : Prentice Hall, 1994. Wormell, Irene. Success factors for fee-based information services. Helsinki : NORDINFO, 1996.