Udofia, O. E. (). „Nigerian Political Parties: Their Role in Modernizing the Political System, 1920–1966”. Journal of Black Studies. 11 (4): 435–447. doi:10.1177/002193478101100404. JSTOR2784073.
Udofia, O. E. (). „Nigerian Political Parties: Their Role in Modernizing the Political System, 1920–1966”. Journal of Black Studies. 11 (4): 435–447. doi:10.1177/002193478101100404. JSTOR2784073.