000
00288 a2200121 4500
020
_a
0749260165
082
_a
621.3815
_b
OPE
090
_c
2526
_d
3068
245
_a
Block 3 digital principles
260
_a
Milton keynes
_b
Open university
_c
1990
_g
1990
300
_a
179p.
_c
29cm
942
_c
SR
999
_c
31587
_d
31587