Sergiovanni, Thomas J. Supervision : a redefinition / Thomas J. Sergiovanni. - 5th.ed. - New York : McGraw-Hill, c,1993. - xix,329 p. ISBN: 007056339x Subjects--Topical Terms: School management and organization--United States.School supervision--United States. LC Class. No.: LB 2806.4 / .S47