@book{55284,
	author = {Friedmann, W.},
	title = {An Introduction To World Politics \},
	publisher = {Macmillan ;},
	year = {1960.},
	address = {London :},
	edition = {Fourth Edition},
	url = {https://fll.law.cu.edu.eg/fulltext/bks/B11-06749..pdf}
}