@book{48339,
	author = {Valdés, Alberto, and Schaeffer, Barry,},
	title = {Surveillance of agricultural prices and trade},
	publisher = {World Bank,},
	year = {c1995.},
	address = {Washington, D.C. :},
	url = {http://www.worldbank.icebox.ingenta.com/content/wb/701}
}