1. .Bigus, J. 2016. Optimism and Auditor Liability. Accounting and Business Research:1-24.
2. .Lutthans, F., Youssef, M., Avolio, J. 2007. Psychological capital . In Psychological capital Developing the Human Competitive Edge Oxford University Press.: 1-250.
3. Aimi Nasuha , N ,B., Nor Aniza , A., Rozita Radhiah , S. 2019. A Systematic Review of the Psychological Capital (PsyCap) Research Development.Implementation and Gaps .International Journal of Academic Research in Progressive Education and Develop, ment, 8(3):133–150.
4. Anugerah ,R. E, Primadona. N, Sari . 2014.Personal Characteristics and Quality of Audit Work Study on Regional Internal Audit Bodies in Indonesia, International Accounting Business Conference:960-970.
5. Boner, s. 2008. judgment and decision making in accounting ,Publisher Pearson, ISBN 10 0138638950 ISBN 13: 9780138638955.