@book{223441,
	author = {Henry, Sue. and Association for the Advancement of Social Work with Groups.},
	title = {Trabajo social con grupos},
	publisher = {Narcea},
	year = {2006.},
	address = {Madrid},
	edition = {2a ed.},
	note = {"<<XXI Simposio>> de la Association for the Advancement of Social Work with Groups, que tuvo lugar en Denver (Colorado), en octubre de 1999". -- Introduction.}
}