@book{161793,
	author = {World Bank.},
	title = {Environmental assessment sourcebook},
	publisher = {xx},
	year = {xx},
	series = {World Bank technical paperx0253-7494 vno. 139-140, 154},
	address = {Washington, D.C. bWorld Bankcc1991.},
	url = {http://ez.urosario.edu.co/login?url=http://elibrary.worldbank.org/content/book/9780821318430}
}