"Africa :: Nigeria". The World Factbook. Central Intelligence Agency. 17a de Majo 2011. Alirita la 10an de Decembro 2021. "Note that coastlines, and borders based on rivers or natural features, are fractals, the length of which is imprecise and depends on the measurement convention adopted."
Udofia, O. E. (1981). “Nigerian Political Parties: Their Role in Modernizing the Political System, 1920–1966”, Journal of Black Studies11 (4), p. 435–447. doi:10.1177/002193478101100404.