@book{216,
	author = {Schmidt, Frank L., and Hunter, John E.},
	title = {Methods of Meta-Analysis :},
	publisher = {SAGE Publications,},
	year = {c2015},
	address = {California:},
	edition = {3rd ed.},
	url = {http://methods.sagepub.com/book/methods-of-meta-analysis/}
}