Clarkson, T., & Willis, T. (1842). Not a labourer wanted for Jamaica: To which is added, an account of the newly erected villages by the peasantry there, and their beneficial results; and of the consequences of re-opening a new slave trade, as it relates to Africa, and the honour of the British government in breaking her treaties with foreign powers: in a letter addressed to a member of Parliament, appointed to sit on the West India committee. T. Ward & Co..

Clarkson, Thomas, and Thomas Willis. Not a Labourer Wanted for Jamaica: To Which Is Added, an Account of the Newly Erected Villages by the Peasantry There, and Their Beneficial Results; and of the Consequences of Re-opening a New Slave Trade, as It Relates to Africa, and the Honour of the British Government in Breaking Her Treaties with Foreign Powers: In a Letter Addressed to a Member of Parliament, Appointed to Sit on the West India Committee. T. Ward & Co., 1842.