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- moneyextra.com Interest Rate History. Retrieved 2008-10-27
- Sidney Homer, Richard Eugene Sylla, Richard Sylla (1996). A History of Interest Rates. Rutgers University Press. pp. 509. ISBN 0813522889. Retrieved 2008-10-27. (also ISBN 9780813522883)
- Bundesbank. BBK - Statistics - Time series database. Retrieved 2008-10-27
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