↑ Lantigua, David. "7 – Faith, Liberty, and the Defense of the Poor: Bishop Las Casas in the History of Human Right", Hertzke, Allen D., and Timothy Samuel Shah, eds. Christianity and Freedom: Historical Perspectives. Cambridge University Press, 2016, 190.
↑ Clayton, Lawrence (2009). “Bartolomé de las Casas and the African Slave Trade”. History Compass (bằng tiếng Anh). 7 (6): 1532. doi:10.1111/j.1478-0542.2009.00639.x. ISSN1478-0542. On advocating the importation of a slaves back in 1516, Las Casas wrote 'the cleric [he often wrote in the third person], many years later, regretted the advice he gave the king on this matter – he judged himself culpable through inadvertence – when he saw proven that the enslavement of blacks was every bit as unjust as that of the Indians...
↑ Murray, Stuart (2009). The Library: An Illustrated History. Skyhorse Publishing. tr. 136.
Las Casas, Bartolomé (1875). Sancho Rayón, José León (biên tập). Historia de Las Indias. 1. Madrid: M. Ginesta.
“David Walker, 1785–1830. Walker's Appeal, in Four Articles”. Together with a Preamble, to the Coloured Citizens of the World, but in Particular, & Very Expressly, to Those of the United States of America. docsouth.unc.edu. Boston, Massachusetts. 28 tháng 9 năm 1829.
