@book{106, author = {Whitten, Jeffrey L. and Bentley, Lonnie D.}, title = {Systems analysis and design methods /}, publisher = {McGraw-Hill Irwin,}, year = {c2004.}, address = {Boston :}, edition = {6th ed.}, url = {http://www.loc.gov/catdir/toc/mh031/2003046322.html} }