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Grossman, Mark (2003). Political corruption in America: an encyclopedia of scandals, power, and greed (2003 ed.). ABC-CLIO. ISBN 978-1-57607-060-4。 - Total pages: 466
Keisling, William (2003). The Sins of Our Fathers (2011 ed.). Yardbird Books/yardbird.com. ISBN 978-0-9620251-0-5。 - Total pages: 167