@book{124983,
	author = {Howitt, Dennis. and Cramer, Duncan.},
	title = {First steps in research and statistics :},
	publisher = {Routledge,},
	year = {2000.},
	address = {Philadelphia :},
	url = {http://www.loc.gov/catdir/enhancements/fy0649/99038285-d.html}
}