@book{30,
	author = {Collier, Paul.},
	title = {The bottom billion :},
	publisher = {Oxford University Press,},
	year = {2008.},
	address = {New York :},
	url = {http://digitale-objekte.hbz-nrw.de/storage/2013/05/27/file_1/5137094.pdf}
}