Cole, G. R. Liberated slaves and Islam in nineteenth-century West Africa: Gibril R. Cole. The Yoruba diaspora in the Atlantic world.(2004).

Cole, Gibril R. "Liberated Slaves and Islam in Nineteenth-century West Africa: Gibril R. Cole." The Yoruba Diaspora in the Atlantic World.(2004) .

Cole, Gibril R. "Liberated Slaves and Islam in Nineteenth-century West Africa: Gibril R. Cole." The Yoruba Diaspora in the Atlantic World.(2004), .