@book{42570,
	author = {Schumpeter  , Joseph A.  and Opie ,  Redvers },
	title = {The Theory Of Economic Development :},
	publisher = { Harvard University Press, },
	year = {1951.},
	address = {Cambridge  :},
	url = {https://fll.law.cu.edu.eg/fulltext/bks/B13-07359.pdf}
}