↑ John K. Thorton, African Background in American Colonization, in The Cambridge economic history of the United States, Stanley L. Engerman, Robert E. Gallman (ed.), Cambridge University Press, 1996, ISBN0-521-39442-2, p. 87. "African states waged war to acquire slaves [...] raids that appear to have been more concerned with obtaining loot (including slaves) than other objectives."
↑ Sir John Bagot Glubb, The Empire of the Arabs, Hodder and Stoughton, 1963, p.283. "...thousand Christian captives formed part of the loot and were subsequently sold as slaves in the markets of Syria".
↑ (tiếng Ba Lan) J. R. Kudelski, Tajemnice nazistowskiej grabieży polskich zbiorów sztuki, Warszawa 2004.
