@book{55,
	title = {Resources, environment, and population},
	publisher = {Population Council},
	year = {1991. },
	address = {New York},
	note = {"Based on a conference held at the Hoover Institution, Stanford University, 1-3 February 1989." },
	url = {http://www.loc.gov/catdir/enhancements/fy0725/91003939-b.html}
}