Valacich, Joseph S.,  1959- <br/><br/>
Essentials of systems analysis and design / 
Joseph S. Valacich, Joey F. George, Jeffrey A. Hoffer. 
 - 2nd ed. 
 - Upper Saddle River, N.J. :  Prentice Hall,  2003. 
 - xxvii, 460 p. :  col. ill. ;  28 cm.