000 003360000a22001450004500
245 _aSupervisory studies
100 _aBetts, Peter W.
250 _a2nd ed.
260 _aLondon
_bMacDonald & Evans
_c1973
300 _axv, 476p. : charts
020 _a0712119299
080 _a658.3-052.24
_bB4
041 _aEN
942 _cBK
999 _c104271
_d104271