000 00315nam a2200121Ia 4500
008 250224s9999 xx 000 0 und d
020 _a335101836
082 _a016.3702854MAD
100 _aMaddison John
245 0 _aInformation Technology And Education
260 _bOpen universityv press
_c1982
942 _cBK
999 _c434899
_d434899