Dyer, Wayne W. Group counseling for personal mastery : everything you need to know to lead any group in any setting / Wayne W. Dyer and John Vriend. - New York : Sovereign Books, c1980. - 277 p. ; 22 cm. Includes index. ISBN: 0671960431 : Subjects--Topical Terms: Group counseling. Dewey Class. No.: 371.4/6