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Gerhard Peters. Ed. John T. Woolley; Gerhard Peters , 编. Presidential Vetoes: Washington - Obama. The American Presidency Project. Santa Barbara, CA: University of California. 1999–2014 [2014-10-07]. (原始内容存档于2014-08-17).
Gerhard Peters. Ed. John T. Woolley; Gerhard Peters , 编. Presidential Vetoes: Washington - Obama. The American Presidency Project. Santa Barbara, CA: University of California. 1999–2014 [2014-10-07]. (原始内容存档于2014-08-17).