1Ashbaugh,H., R. LaFond, and B.W.Mayhew. 2003. Do nonaudit services compromise auditor independence?[J] Auditing: A Journal of Practice & Theory 25(1 ):85-98.
2Barkess, L. and Simnett, R. 1994.The Provision of Other Services by Auditors: Independence and Pricing Issues.[J] Accounting and Business Research, 24(94),pp.99-108.
3Chung, H. and Kallapur, S. 2003. Client Importance, Non- audit Services, and Abnormal Accruals.[J]Accounting Review 78(4):931-955.
4The Commission on Auditors' Responsibilities.(Cohen Report). 1978. Report, Conclusions, and Recommendations. [R]1-223.
5Craswell, A.T. 1999. Does the Provision on Non-Audit Services Impair Auditor Independence? [J]lnternational Journal of Auditing, 3, pp.29-40.
6Dee, C.C., Lulseged, A. and Nowlin, T.S. 2002.Earnings Quality and Auditor Independence: An Examination Using Non-audit Fee Data' , SSRN Working Paper.
7DeFond, M.L.,K.Raghunandan, and K.R.Subramanyam. 2002. Do nonaudit service fees impair auditor independence? Evidence from going-concern audit opinions.[J] Journal of Accounting Research 40(4):1247-1274.
8Hartley, R.V. and Ross, T.L. 1972. MAS and Audit Independence: An Image Preblem.[J] Journal of Accountancy, November, pp.42-51.
9Jensen, M,C. and Meckling, W.H. 1976.Theory of the firm: managerial behavior, agency costs and ownership structure. [J]Journal of Financial Economics 3, pp305-360.
10Krishnan, J. Lixin(Nancy) Su, and Yinqi Zhang. 2011. Nonaudit Services and Earnings Management in the Pre- Sox and Post-Sox Eras. [J] Auditing: A Journal of Practice & Theory. 30(3): 103-123.