00274nam a2200109 a 450000500170000008200170001710000170003424500390005126000320009030000280012263000140015020251202164233.0  a371.201bBUS  aBush ,  Tony  aTheories of educational management  aLondonbHarper  & Rowc1986  aviii,143 p.b22 cm.cPB  aEducation