APA (7th ed.) Citation

O'Ballance. (1977). The secret war in the Sudan, 1955-1972. Archon Books.

Chicago Style (17th ed.) Citation

O'Ballance. The Secret War in the Sudan, 1955-1972. Hamden, Conn: Archon Books, 1977.

MLA (8th ed.) Citation

O'Ballance. The Secret War in the Sudan, 1955-1972. Archon Books, 1977.

Warning: These citations may not always be 100% accurate.