Clifford, Sarah Hutchinson. <br/><br/>
Computers, communications, and information :  a user's introduction / 
Sarah E. Hutchinson, Stacey C. Sawyer; with contributions by Glen J. Coulthard. 
 - Rev. ed. 
 - Boston :  Irwin/McGraw-Hill,  c1998. 
 - 1 v. (various pagings) :  ill. (some col.) ;  28 cm.