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Cody 1956, p. 142; Metz 1989. Metz, H. C. (1989). Libya: A Country Study. Area Handbook Series (4th ed.). Washington, DC: Library of Congress. Federal Research Division. OCLC473404917.
Metz 1989. Metz, H. C. (1989). Libya: A Country Study. Area Handbook Series (4th ed.). Washington, DC: Library of Congress. Federal Research Division. OCLC473404917.