00330nam a2200121Ia 4500008004100000100003600041245003000077260002700107300000900134650004300143942000700186999001500193190216s9999||||xx |||||||||||||| ||und||  aSteve Skidmore &brenda Wroe 0aIntroducing System Design  bBpb Publicationsc1992  a308p  a"Computer Programming. Programs, Data"  cBK  c8375d8375