Sufian, F., and M. S. Habibullah. “FINANCIAL CRISIS, IMF, AND BANK EFFICIENCY: EMPIRICAL EVIDENCE FROM THE ASEAN-4 BANKING SECTORS”. Buletin Ekonomi Moneter Dan Perbankan, Vol. 12, no. 2, Oct. 2010, pp. 123-50, doi:10.21098/bemp.v12i2.369.