References
^ Richelson, Hildy; Richelson, Stan (2015). Bonds : The Unbeaten Path to Secure Investment Growth, Bloomberg Press. BiggerBooks. ISBN 9781118004463 (revised Oct 2023)^ (2013). Bonds : The Unbeaten Path to Secure Investment Growth ECampus. ISBN 9781118004463 (revised Jun 2016)
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