@book{40049,
	author = {Baer, Hans A. and Singer, Merrill},
	title = {Medical anthropology and the world system},
	publisher = {Praeger},
	year = {2003},
	address = {Westport (Connecticut, Estados Unidos)},
	edition = {2nd ed},
	url = {http://www.loc.gov/catdir/toc/fy044/2003052887.html}
}