@book{38672,
	author = {Solomon, Phyllis L. and Cavanaugh, Mary M.},
	title = {Randomized controlled trials},
	publisher = {Oxford University Press,},
	year = {2009.},
	series = {Pocket guides to social work research methods},
	address = {New York ;},
	url = {http://dx.doi.org/10.1093/acprof:oso/9780195333190.001.0001}
}