https://www.theguardian.com/world/2008/feb/25/barackobama.hillaryclinton

 http://www.telegraph.co.uk/news/worldnews/barackobama/8478044/Birther-row-began-with-Hillary-Clinton.html

https://www.washingtonpost.com/news/book-party/wp/2015/01/29/the-moment-obama-knew-he-would-beat-hillary-clinton-for-the-2008-nomination/?utm_term=.aba5e345d91e

 http://www.theatlantic.com/politics/archive/2008/08/penn-strategy-memo-march-19-2008/37952/