@book{8050,
	author = {Zeithaml, Valarie A. and Bitner, Mary Jo.},
	title = {Services marketing:},
	publisher = {McGraw-Hill Irwin,},
	year = {2013.},
	address = {New York:},
	edition = {6th ed.},
	url = {http://catdir.loc.gov/catdir/enhancements/fy1205/2011051073-b.html}
}