Shinn, David H. (2015). "European Union, Britain, and France"(PDF). In Berry (ed.). Sudan: a country study (5th ed.). Washington, D.C.: Federal Research Division, Library of Congress. pp. 291–292. ISBN978-0-8444-0750-0. Though published in 2015, this work covers events in the whole of Sudan (including present-day South Sudan) until the 2011 secession of South Sudan.{{cite encyclopedia}}: תחזוקה - ציטוט: postscript (link)