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2. Industry briefs: Viant
3. Bailey, R. W. (1993). Performance versus preference. In Proceedings of the Human Factors and Ergonomics Society 37th Annual Meeting (pp. 282-286). Santa Monica, CA: Human Factors and Ergonomics Society.
4. Industry briefs: MONKEYmedia
5. Beardon, W. O. & Netemeyer, R. G. (1999). Handbook of marketing scales (2nd ed.). Thousand Oaks, CA: Sage.