Wilks, S. C., & Howley, W. (1830). The duty of prompt and complete abolition of colonial slavery: A sermon preached at Bentinck Chapel, St. Mary-le-Bone on Sunday, September 26, 1830 : with a letter to His Grace the Archbishop of Canterbury and an appendix of episcopal testimonies (2nd ed.). London: J. Hatchard.

Wilks, Samuel Charles, and William Howley. The Duty of Prompt and Complete Abolition of Colonial Slavery: A Sermon Preached At Bentinck Chapel, St. Mary-le-Bone On Sunday, September 26, 1830 : With a Letter to His Grace the Archbishop of Canterbury and an Appendix of Episcopal Testimonies. 2nd ed. London: J. Hatchard, 1830.

Wilks, Samuel Charles, and William Howley. The Duty of Prompt and Complete Abolition of Colonial Slavery: A Sermon Preached At Bentinck Chapel, St. Mary-le-Bone On Sunday, September 26, 1830 : With a Letter to His Grace the Archbishop of Canterbury and an Appendix of Episcopal Testimonies. 2nd ed. London: J. Hatchard, 1830.