5DeAngelo, L. 1981. Auditor Size and Audit Quality[J]. Journal of A ccounting and Economics ( 3 ) 183-199.
6Jensen, M. , Meckling, W.. 1976. Theory of the Firm: Managerial Behavior, Agency Costs, and Ownership Structure[J]. Journal of Financial Economics (3) 305-360.
7Ross L. Watts and Jerold L. Zimmerman. 1981. The Market For Independence and Independent Auditors. Un -published working paper.
8DeAngelo,L,Auditor Size and Audit Quality, Journal of Accounting and Economics1981, 3,183-199.