@book{77648,
	author = {Serge , Berstein. and Roussellier , Nicolas},
	title = {Histoire générale des systèmes politiques : },
	publisher = {Presses Universitaires de France , },
	year = {1998.},
	address = {Paris :},
	url = {https://fll.law.cu.edu.eg/fulltext/bks/B08-03932.pdf}
}