@book{36929,
	author = {Dattalo, Patrick.},
	title = {Determining sample size},
	publisher = {Oxford University Press,},
	year = {2008.},
	series = {Pocket guides to social work research methods},
	address = {Oxford :},
	url = {http://dx.doi.org/10.1093/acprof:oso/9780195315493.001.0001}
}