@book{60639,
	author = {Zweigert, Konrad, and Kropholler, Jan},
	title = {Sources of international uniform law.},
	publisher = {Sijthoff},
	year = {1971-73.},
	address = {Leiden},
	note = {At head of title: Max-Planck-Institut für Ausländisches und Internationales Privatrecht.}
}