Thu, P. A., T. H. T. Khanh, N. T. T. Ha, and N. V. Khuong. “Perceived Audit Quality, Earnings Management and Cost of Debt Capital: Evidence from the Energy Listed Firms on Vietnam’s Stock Market”. International Journal of Energy Economics and Policy, vol. 8, no. 6, Oct. 2018, pp. 120-7, https://www.econjournals.com/index.php/ijeep/article/view/6992.