In 1957, he wrote a book on his ethnic group, the Egba's, the book was titled: 'The Egba's and their Neighbours', It was originally written as a dissertation but later turned into a 99-page text. He focused on the position of Egba's within historical contexts and factors that effected change in Yorubaland. The book also contained information on Egbaland during the coming of the Christian missionaries in the nineteenth century. At the time, the book was the second Nigerian authored historical study published by the Oxford University Press, after Kenneth Dike's, Trade and Politics in the Niger Delta. He later wrote 'Sources of Yoruba History', published in 1973, and a few other books.