Schmuck, Richard A. Group processes in the classroom / Richard A. Schmuck, Patricia A. Schmuck. - 2nd ed. - Dubuque, Iowa : W. C. Brown, [1975]. - xvi, 217 p. : ill. ; 23 cm. Includes bibliogr. references and index. ISBN: 0697060896 Subjects--Topical Terms: Group work in education.Social groups.