The following book is available in Lippincott Library:
Author: Oppenheim, Lynn
Title: A study of the effects of the use of overhead transparencies on business meetings
Publisher: Philadelphia : Wharton Applied Research Center, The Wharton School, University of Pennsylvania, 1981.
Call Number: HD30.3 .O68 1981
The above study was about the use of overhead transparencies, not videos, as has often been reported in the press.