000 00306nam a2200121Ia 4500
001 81033
008 170722s9999 xx 000 0 und d
100 _aO'day, Edward F.
245 _aProgrammed instruction
_bTeacniques and trends /
260 _c1971.
490 _aCentury Psycology series
942 _cGEN
999 _c84265
_d84265