00297nam a2200109 a 450000500170000002000150001708200200003210000190005224500500007126000450012130000210016620251203091957.0  a0071132805  a004.21,bD, edw  aEdwards, Perry  aSystems analysis & Design, Perry Edwards, eng  aNew York, Mitchell McGraw-Hill, Usc1993  axxii,521p.c20cm