I have found a number of books, newspapers, magazines and other sources invaluable. I have referred to most of them in the text. But for those interested in further reading, here are some of the books which I found most useful.
Abdullah, King of Jordan, Our Last Best Chance (Allen Lane, 2011)
Adair, John, The Leadership of Muhammad (Kogan Page, 2008)
Aldrich, Gary Unlimited Access (Regnery Publishing 1996)
Al-Qasimi Sultan bin Muhammad, My Early Life (2009) Taking the Reins (2012) both Bloomsbury
Atwan, Abdel Bari, The Secret History of al-Qa’ida (Saqi Books, 2006)
Blair, Tony, A Journey (Hutchinson, 2012)
Bush, George W., A Charge to Keep (William Morrow, 1999)
Brown, Ben, Three Days in May (Faber, 2011)
Churchill, Winston, ...