@book{5571,
	author = {Clemente,, Manuel, and Roldão,, Helena},
	title = {Porquê e para quê?},
	publisher = {Assírio & Alvim,},
	year = {D.L. 2010},
	series = {Peninsulares},
	address = {Lisboa},
	url = {http://rnod.bnportugal.gov.pt/ImagesBN/winlibimg.aspx?skey=&doc=1788807&img=1088&save=true}
}