APA (7th ed.) Citation

Library of Congress. Federal Research Division & Metz, H. C. (1991). Sudan: A country study. Federal Research Division.

Chicago Style (17th ed.) Citation

Library of Congress. Federal Research Division and Helen Chapin Metz. Sudan: A Country Study. Washington, D.C.: Federal Research Division, 1991.

MLA (9th ed.) Citation

Library of Congress. Federal Research Division and Helen Chapin Metz. Sudan: A Country Study. Federal Research Division, 1991.