Sherif, Muzafer. Group conflict and co-operatipon : their social psychology / Muzafer Sherif. - London : Routlege and Kegan Paul, c 1966. - 192 p. : ill. ; 23 cm. Includes index. 300 300 Subjects--Topical Terms: Sociology and anthropology Subjects--Geographic Terms: Great Britain. Dewey Class. No.: 301.15 / M43g