AKPAN, Uwem J. Nigeria and the Challenge of National Integration: Lessons from Pre-colonial Diplomacy . International Journal of Social Sciences, [S. l.], v. 10, n. 4, p. 145–160, 2016. Disponível em: http://mail.ijss.com.ng/index.php/home/article/view/44. Acesso em: 18 jun. 2026.