Perry, George W. Case-studies in teaching [by] George W. Perry [and] Pauline Perry. - London, Pitman, 1969. Bibliography: p. 22-23. ISBN: 0273401343 10/6 LCCN: 77416163 Nat. Bib. No.: B69-12062 Subjects--Topical Terms: Teaching -- Case studies.--Teaching -- Case studies. LC Class. No.: LB1025.2 / .P4 Dewey Class. No.: 371.1/001/86