Retrieved 12 October 2016.  Correspondence with the British Commissioners, at Sierra Leone, the Havana, Rio de Janeiro, and Surinam: Relating to the Slave Trade, from January 1 to December 31, 1842, Inclusive.
Truy cập ngày 22 tháng 11 năm 2016.  ^ Correspondence with the British Commissioners, at Sierra Leone, the Havana, Rio de Janeiro, and Surinam: Relating to the Slave Trade, from January 1 to December 31, 1842, Inclusive.