1. Accountancy Age (2005a). Another auditor quits Easier, 11 August.
2. Accountancy Age (2005b). BDO steps up to FTSE100, 30th June.
3. Final Report to the US Treasury;Advisory Committee on the Auditing Profession,2008
4. The effect of Enron, Andersen, and Sarbanes-Oxley on the US market for audit services;Asthana;Accounting Research Journal,2009
5. Ballas, A., 2005. Market shares and concentration in the EU auditing industry, Paper presented at the European Accounting Association annual conference, Gothenberg.