Istori︠i︡a Nigerii v novoe i noveĭshee vrem︠i︡a - Zotova, ︠I︡Uli︠i︡a Nikolaevna; Sledzevskiĭ, Igorʹ Vasilʹevich (Istori︠i︡a stran Afriki., 1981)