@book{641,
	author = {Babbie, Earl R.},
	title = {The practice of social research /},
	publisher = {Wadsworth Cengage,},
	year = {c2010.},
	address = {Belmont, Calif  :},
	edition = {12th ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy1104/2008933881-b.html}
}