Richard F. Nyrop؛ American University (Washington, D.C.). Foreign Area Studies؛ Stanford Research Institute (1973). Area handbook for Libya. U.S. Govt. Print. Off. ص. 160. مؤرشف من الأصل في 2019-12-16.
Richard F. Nyrop؛ American University (Washington, D.C.). Foreign Area Studies؛ Stanford Research Institute (1973). Area handbook for Libya. U.S. Govt. Print. Off. ص. 160. مؤرشف من الأصل في 2019-12-16.