@book{57689,
	author = {Clapham, J.H},
	title = {The Cambridge Economic History : },
	publisher = {At the University Press, },
	year = {1941.},
	address = {Cambridge : },
	edition = { },
	url = {https://fll.law.cu.edu.eg/fulltext/bks/B13-09851.pdf}
}