ERIC Clearinghouse on Educational Management; Bridges, Edwin M.; Hallinger, Philip, 1952-(Eugene, OR : ERIC Clearinghouse on Educational Management, College of Education, University of Oregon, 1995)
ERIC Clearinghouse on Educational Management; Bridges, Edwin M.; Groves, Barry(Eugene, OR : ERIC Clearinghouse on Educational Management, College of Education, University of Oregon, 1990)
ERIC Clearinghouse on Educational Management; Bridges, Edwin M.; Hallinger, Philip, 1952-(Eugene, OR : ERIC Clearinghouse on Educational Management, College of Education, University of Oregon, 1992)