@book{6004, author = {Walker, Orville C. and Mullins, John W.}, title = {Marketing strategy :}, publisher = {McGraw-Hill Irwin,}, year = {c2008.}, address = {Boston :}, edition = {6th ed.}, url = {http://catdir.loc.gov/catdir/enhancements/fy0743/2007034854-t.html} }