Wilson, Stephen, 1940- Informal groups : an introduction / Stephen Wilson - Englewood Cliffs, N.J. : Prentice-Hall, c1978 - xiii, 305 p. : ill. ; 23 cm. - Prentice-Hall series in sociology . Includes bibliographical references and index ISBN: 0134646363 : USD 13.95 Subjects--Topical Terms: Small groups Dewey Class. No.: 301.185