From Citizendium, the Citizens' Compendium
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- Bentham, Jeremy: Defence of Usury, Payne and Foss, 1818 
- Belloc, Hillaire: "On Usury" in Essays of a Catholic, T A N Books & Publishers, 1923 .
- Whiffin, Andrew and others: Interactive: Sovereign debt levels by country, Financial Times, June 23 2010 .