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Retrieved 1 April 2015.  http://www.pwc.com/gx/en/audit-services/capital-market/publications/assets/document/pwc-global-top-100-march-update.pdf

2016. "America's Largest Private Companies". Forbes. 6 August 2016. Retrieved 6 August 2016.  Rachael Singh (29 May 2012). "Deloitte overtakes PwC as