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Johnson Douglas H. 2012. “The Heglig Oil Dispute between Sudan and South Sudan.” Journal of Eastern African Studies 6 (3): 561–69.
Johnson Douglas H. 2014. “Briefing: the Crisis in South Sudan.” African Affairs 113 (451): 300–309.
LeRiche Matthew, and Arnold Matthew. 2012. South Sudan from Revolution to Independence. London: Hurst & Co.
Nyaba Peter Adwok. 2011. South Sudan: The State We Aspire to. Cape Town: Centre for Advanced Study of African Society.