1. Hugh Thomas, The Slave Trade: The History of the Atlantic Slave Trade, 1440–1870 (London: Picador, 1997), pp. 146–9.
2. David Brion Davis, The Problem of Slavery in Western Culture (Ithaca: Cornell University Press, 1966), p. 317.
3. See George S. Brookes, Friend Anthony Benezet (Philadelphia: University of Pennsylvania Press, 1937) for biography and for reprints of many of the letters.
4. Letters of the Late Ignatius Sancho, An African (1782), ed. Vincent Carretta (London: Penguin, 1998), p. 164.
5. For biography, see Folarin Shyllon, James Ramsay: The Unknown Abolitionist (Edinburgh: Canongate, 1977).