7Ashbaugh-Skaife, H. Collins and D. , Kinney (2007) "The Discovery and Reporting of Internal Control Deficiencies prior to SOX-mandated Audit", Journal of Accounting and Economics, Vol. 44, pp. 166 - 192.
8Basu,S. , Hwang, L. and Jan,C. (2000) "Differences in Conservatism between Big Eight and Non-Big Eight Au- ditors" Working Paper, City University of New York and California State University, Hayward.
9Doyle,J. , W. Ge, and S. McVay (2007) "Determinants of Weakness in Internal Controls over Financial Reproting", ,Journal of Accounting and Economics,44 ,pp. 193 -223.
10The AICPA Audit Committee (2004) "Internal Control: A Tool for the Audit Committee", the American Institute of Certified Public Accountants, Inc. , New York.