Purkey, William Watson. Inviting positive classroom discipline / by William Watson Purkey and David B. Strahan. - Westerville, Ohio : National Middle School Association, 2002. - p. cm. Includes bibliographical references. ISBN: 1560901292 (pbk.) LCCN: 2002141552 Subjects--Topical Terms: Classroom management.School discipline. LC Class. No.: LB3013 / .P86 2002 Dewey Class. No.: 371.102/4