Thorpe, R., & Wilberforce, W. (1815). A letter to William Wilberforce, Esq. M.P., vice president of the African Institution, &c. &c. &c.: Containing remarks on the reports of the Sierra Leone Company, and African Institution, with hints respecting the means by which an universal abolition of the slave trade might be carried into effect (3rd ed.). Printed for F.C. and J. Rivington, by Law and Gilbert.

Thorpe, Robert, agus William Wilberforce. A Letter to William Wilberforce, Esq. M.P., Vice President of the African Institution, &c. &c. &c.: Containing Remarks on the Reports of the Sierra Leone Company, and African Institution, with Hints Respecting the Means by Which an Universal Abolition of the Slave Trade Might Be Carried into Effect. 3rd ed. London: Printed for F.C. and J. Rivington, by Law and Gilbert, 1815.

Thorpe, Robert, agus William Wilberforce. A Letter to William Wilberforce, Esq. M.P., Vice President of the African Institution, &c. &c. &c.: Containing Remarks on the Reports of the Sierra Leone Company, and African Institution, with Hints Respecting the Means by Which an Universal Abolition of the Slave Trade Might Be Carried into Effect. 3rd ed. Printed for F.C. and J. Rivington, by Law and Gilbert, 1815.