The University of Minnesota/3M, Douglas R. Vogel, Gary W. Dickson, and John A. Lehman, Persuasion and the Role of Visual Presentation Support: The UM/3M Study, 1986.
The 3M/Wharton School, A Study of the Effects of the Use of Overhead Transparencies on Business Meetings, Wharton Applied Research Center, Wharton School, University of Pennsylvania, 1981.