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Amin, Julius A. (March 2020). "Cameroon's relations toward Nigeria: a foreign policy of pragmatism". The Journal of Modern African Studies. 58 (1): 1–22. doi:10.1017/S0022278X19000545. S2CID214047726.
Eigo, Tim; Donaldson, Catherine Victoria (2018). "Paul Biya". encyclopedia.com (three essays on Paul Biya's presidency with the following source information: Contemporary Black Biography (May 2018, author Tim Eigo), Newsmakers 2006 Cumulation (May 2018, author Catherine Victoria Donaldson) and Encyclopedia of World Biography (May 2018)). Archived from the original on 29 March 2024. Retrieved 29 March 2024.