Valacich, Joseph S. Essentials of systems analysis and design / Joseph S. Valacich ; Joey F. George ; Jeffrey A. Hoffer. - 2nd ed. - New Delhi : Prentice Hall of India, 2004. - xxxi, 460 p. ill. 27 cm. ISBN: 8120323122 Subjects--Topical Terms: System Analysis System Design Dewey Class. No.: 004.21 / VAL