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Liebman and Olasin (1980a, June 15). Advertising information systems. ANA - ESOMAR. Retrieved November 02, 2024, from
https://ana.esomar.org/documents/advertising-information-systems
Liebman and Olasin (1979a, March 01). Software requirements for effective marketing and advertising information systems. ANA - ESOMAR. Retrieved November 02, 2024, from