TY  - BOOK
AU  -  Amadio, william. 
TI  -  Systems development : a practical approach / William Amadio. 
SN  - 0071004564
U1  - 004.21 AMA 
CY  -  New York : mcgraw-Hill, c1989. 
KW  -  System design. 2.System analysis.
ER  -