Culbertson, J. A. (1974). Performance objectives for school principals: Concepts and instruments. McCutchan Pub.
Citace podle Chicago (17th ed.)Culbertson, Jack A. Performance Objectives for School Principals: Concepts and Instruments. Berkeley, Calif: McCutchan Pub, 1974.
Citace podle MLA (9th ed.)Culbertson, Jack A. Performance Objectives for School Principals: Concepts and Instruments. McCutchan Pub, 1974.
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