@book{4060,
	author = {Pitt, Mark Martin, and Rosenzweig, Mark Richard,},
	title = {The selectivity of fertility and the determinants of human capital investments :},
	publisher = {World Bank,},
	year = {1990.},
	series = {LSMS working paper,},
	address = {Washington, D.C. :},
	url = {http://books.google.com/books?id=nJHpAAAAIAAJ}
}