Personal influence; the part played by people in the flow of mass communications,
by Elihu Katz and Paul F. Lazarsfeld. With a foreword by Elmo Roper.
- Glencoe, Ill., Free Press [1955]
- xx, 400 p. diagrs., forms, tables. 22 cm.
- Foundations of communications research .
"A report of the Bureau of Applied Social Research, Columbia University."