Clarkson, T. (1823). Thoughts on the necessity of improving the condition of the slaves in the British colonies: With a view to their ultimate emancipation; and on the practicability, the safety, and the advantages of the latter measure (2d ed.). Printed for the Society for the Mitigation and gradual Abolition of Slavery throughout the British Dominions.

Clarkson, Thomas. Thoughts on the Necessity of Improving the Condition of the Slaves in the British Colonies: With a View to Their Ultimate Emancipation; and on the Practicability, the Safety, and the Advantages of the Latter Measure. 2d ed. Printed for the Society for the Mitigation and gradual Abolition of Slavery throughout the British Dominions, 1823.