00409nam a22001217a 4500082002600000100002100026245009400047260005700141300002100198650002600219700002100245700002100266  aProf. 371.3 M621 19711 aMichael, Jack L.10aManaging classroom contingencies /cJack L. Michael, Carole S. Waina and Robert L. Baker.  aCalifornia :bSouthwest Regional Laboratory,cc1971.  a248 p. ;b22 cm.14aClassroom techniques.1 aWaina, Carole S.1 aBaker, Robert L.