[1]van Bavel, B. (2019). The Invisible Hand? How Market Economies Have Emerged and Declined Since AD 500. Storbritannien: OUP Oxford. p. 69-70
Black, J. (2015). The Atlantic Slave Trade in World History. USA: Taylor & Francis. p. 14 [2]
[3]Hazell, A. (2011). The Last Slave Market: Dr John Kirk and the Struggle to End the East African Slave Trade. Storbritannien: Little, Brown Book Group.
Black, J. (2015). The Atlantic Slave Trade in World History. USA: Taylor & Francis. p. 14 [4]
