000 00288 a2200121 4500
020 _a0749260165
082 _a621.3815
_bOPE
090 _c2526
_d3068
245 _aBlock 3 digital principles
260 _aMilton keynes
_bOpen university
_c1990
_g1990
300 _a179p.
_c29cm
942 _cSR
999 _c31587
_d31587