1. Adegbola, E. A. Adeolu. “Ifa and Christianity among the Yoruba: A study in symbiosis and in the development of Yoruba Christology, 1890–1940.” PhD Diss., University of Bristol, 1976.
2. Ajayi, J. F. A. Christian Missions in Nigeria, 1841–1881: The Making of a New Elite. London: Longman, 1965.
3. Ajayi, J. F.A. “Lecture III: Crowther and Trade on the Niger” Henry Martyn Lectures 1999.
https://www.cccw.cam.ac.uk/wp-content/uploads/2017/07/Ajayi-Prof-Jacob-F.-Ade-252628-Oct.lect-3.pdf
4. Ayandele, E. A. “Review of John B. Grimley and Gordon E. Robinson, Church growth in central and southern Nigeria.” In Journal of African History 8, no. 2 (1967).
5. Barnes, J. S. “Partnership in Christian Mission. A History of the Protestant Missionary Movement.” PhD Diss., University of Kwa Zulu-Natal, 2010.