000 00334nam a2200133Ia 4500
008 190723s9999 xx 000 0 und d
020 _a978-0-470.87430-1
100 _aRuth Colvin
245 0 _aE-Learning and the Science of Instruction
250 _a3rd
260 _aSan Francisco
_bPfeiffer
_c2011
300 _a502.:p
942 _cBK
999 _c1692
_d1692