@book{226753,
	author = {Portman, Michael E. and SpringerLink (Online service)},
	title = {Generalized Anxiety Disorder Across the Lifespan},
	publisher = {Springer New York},
	year = {2009.},
	address = {New York, NY},
	url = {http://dx.doi.org/10.1007/978-0-387-89243-6}
}