Karls, James M. PIE manual person-in-environment system the PIE classification system for social functioning problems / James M. Karls and Karin E. Wandrei. - Washington, D.C. NASW Press, National Association of Social Workers c2003. - vii, 65 p. 28 cm. Includes bibliographical references. ISBN: 0871012545 LCCN: 9434762 Subjects--Topical Terms: Person-in-environment system. LC Class. No.: HV43.5 / .K37 1994 Dewey Class. No.: 361.1014 / K1855p