@book{128122,
	author = {ROYSE, D.},
	title = {RESEARCH METHODS IN SOCIAL WORK, 4TH ED.},
	publisher = {THOMSON LEARNING},
	year = {2004},
	address = {Londres},
	url = {http://www.siis.net/documentos/Digitalizados/900007_Research Methods in Social Work.pdf}
}