Harnack, Robert Victor, 1927- Group discussion; theory and technique / [by] R. Victor Harnack [and] Thorrel B. Fest. - New York : Appleton-Century-Crofts, [1964]. - xiv, 456 p. : illus. ; 22 cm. Includes bibliographies. LCCN: 64010513 Subjects--Topical Terms: Discussion. LC Class. No.: LC6515 / .H35 Dewey Class. No.: 374.22 / HAG 1964