Sales, Esther. Individual and group supervision in field instruction : a research report / by Esther Sales with Elizabeth Navarre. - [Ann Arbor] : School of Social Work, University of Michigan, [c1970]. - vii, 83 p. ; 23 cm. - 361.3/071/177435 . Includes bibliographical references. Subjects--Topical Terms: Social work education--Michigan. Dewey Class. No.: 361.3/071/177435