Library of Congress. Federal Research Division & Metz, H. C. (1992). Sudan: A country study (4th ed.). Federal Research Division, Library of Congress : For sale by the Supt. of Docs., U.S. G.P.O..
Citace podle Chicago (17th ed.)Library of Congress. Federal Research Division a Helen Chapin Metz. Sudan: A Country Study. 4th ed. Washington, D.C.: Federal Research Division, Library of Congress : For sale by the Supt. of Docs., U.S. G.P.O., 1992.
Citace podle MLA (8th ed.)Library of Congress. Federal Research Division a Helen Chapin Metz. Sudan: A Country Study. 4th ed. Federal Research Division, Library of Congress : For sale by the Supt. of Docs., U.S. G.P.O., 1992.
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