000
00334nam a2200133Ia 4500
008
190723s9999 xx 000 0 und d
020
_a
978-0-470.87430-1
100
_a
Ruth Colvin
245
0
_a
E-Learning and the Science of Instruction
250
_a
3rd
260
_a
San Francisco
_b
Pfeiffer
_c
2011
300
_a
502.:p
942
_c
BK
999
_c
1692
_d
1692