000 00271nam a2200121Ia 4500
100 _aVockell, Edward L.
020 _a0-02-423070-7
942 _cBK
245 _aEducational Research
260 _aMacmillan, New york
_c1983
082 _a370.78 Voc
300 _aviii, 392
999 _c16285
_d16285