Jacobson, Paul Benjamin The effective school principal - 2. ed. - Englewood Cliffs, N.J. Prentice-Hall 1963. - 532 p. ill. First published in 1941 under title : Duties of school principals. LCCN: Subjects--Topical Terms: School principals LC Class. No.: LB2805 / .J2 1963 Dewey Class. No.: 371