Civil War(нявызн.). countrystudies.us. Federal Research Division of the Library of Congress (18 студзеня 1991). — «The estimated number of deaths ranged as high as 30,000. More than 1 million Igbo returned to the Eastern Region. In retaliation, some northerners were massacred in Port Harcourt and other eastern cities, and a counterexodus of non-Igbo was under way.» Праверана November 21, 2019.
Last, Murray (October 2005). "Poison and Medicine: Ethnicity, Power and Violence in a Nigerian City, 1966–1986 by Douglas A. Anthony Review by: Murray Last". The Royal African Society. 104 (417): 710–711. JSTOR3518821.