^Gold, Michael; Rashbaum, William K.; Slotnik, Daniel E. (15 July 2020). "Dismemberment Killing of Tech C.E.O. 'Looks Like Professional Job'". The New York Times. Retrieved 16 July 2020. Motorcycle taxis, called okada in Nigeria, have long been popular in Lagos and many other African cities as a way to circumvent traffic jams.
^Ezeibe, Nzeadibe, Ali, Udeogu, Nwankwo and Ogbodo (2017). "Work on wheels: collective organising of motorcycle taxis in Nigerian cities". International Development Planning Review. 39 (3): 249–273. doi:10.3828/idpr.2017.10.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^Mbella Mouelle, Stephanie Laura (2014). Complex Causality between Transportation and Human Security: A Special Focus on the City of Douala, Cameroon (Thesis). ProQuest1625048725.