Crowley, Michael (2009年9月24日). “HawkDown” (英語). The New Republic 2020年12月23日閲覧. "Even before Obama announced his run for president, Biden was warning that Afghanistan, not Iraq, was the 'central front' in the war against Al Qaeda, requiring a major U.S. commitment. 'Whatever it takes, we should do it,' Biden said in February 2002."
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Leubsdorf, Carl P. (1987年9月6日).
Keeps Sights Set On White House”. The Dallas Morning News Reprinted in “Lifelong ambition led Joe Biden to Senate, White House aspirations”. ダラス・モーニングニュース. (2008年8月23日)