Oliva, P. F. (2001). Supervision for today's schools (6th ed.). New York: John Wiley and Sons.
Παραπομπή Chicago StyleOliva, Peter F. Supervision for Today's Schools. 6th ed. New York: John Wiley and Sons, 2001.
Παραπομπή MLAOliva, Peter F. Supervision for Today's Schools. 6th ed. New York: John Wiley and Sons, 2001.
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