Group discussion theory and technique
Harnack, R. Victor.
Fest, Thorrel B.
Jones, Barbara Schindler.
Englewood Cliffs London Prentice-Hall
1977
Previous ed.: / by R. Victor Harnack and Thorrel B. Fest. New York : Appleton-Century-Crofts, 1964
Bibliography: - Includes index
Discussion.