@book{199623,
	author = {Hunter, John E. and Schmidt, Frank L.,},
	title = {Methods of meta-analysis},
	publisher = {Sage},
	year = {c2004.},
	address = {Thousand Oaks, Calif.},
	edition = {2nd ed.},
	url = {http://www.loc.gov/catdir/toc/ecip0411/2003026057.html}
}