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4Robert Roy Britt.America's Superpower Status Threatened by Financial Crisis.Live Science,10 October 2008.http:// www.livescience.com/culture/081010-world-order.html.
7Irwin Stelzer.Global economy has no substitute for falling dollar.The Sunday Times,October 25,2009.http://business.timesonline.co.uk/tol/business/economics/article6888848.ece.
8Niall Ferguson.The trillion dollar question:China or America?Telegraph,01 Jun 2009.http://www.telegraph.co.uk/ comment/5424112/The-trillion-dollar-question-China-or-America.html.
9Paul Kennedy.Is this the end of the American era ? The Sunday Times,October 12,2008.http://www.timesonline.co.uk/tol/news/world/us_and_americas/article4926356.ece.