@book{43104,
	author = {Schumpeter , Joseph A.  and Opie ,. Redvers },
	title = {The Theory Of Economic Development :},
	publisher = {Harvard University Press  ,},
	year = {1934.},
	series = {Harvard Economic Studies },
	address = {Cambridge :},
	url = {https://fll.law.cu.edu.eg/fulltext/bks/B13-07508.pdf}
}