Goldberg, Carl. The human circle : an existential approach to the new group therapies / by Carl Goldberg, with Merle Cantor Goldberg. - Chicago : Nelson-Hall Co., 1973. - 257 p. : ill. ; 24 cm. Includes bibliographical references (p. 235-246) and index. ISBN: 0911012672 LCCN: 73-075523 Subjects--Topical Terms: Group psychotherapy.Existential psychotherapy.