1. Ahmad, H., Othman, R., & Jusoff, K. (2009). The effectiveness of internal audit in Malaysian public sector, Journal of Modern Accounting and Auditing, 5(9), 53-62.
2. Ahmi, A., Saidin, S. Z., Abdullah, A., Che Ahmad, A., & Ismail, N. A. (2016). State of Information Technology Adoption by Internal Audit Department in Malaysian Public Sector. International Journal of Economics and Financial Issues, 6(7s), 103–108.
3. Allen, W. T., & Siegel, A. (2002). Threats and safeguards in the determination of auditor independence. Wash. ULQ, 80, 519.
4. Awadelhag, A. (2008). Internal audit in Sudan: Future and prospects, The First Internal Audit Conference, Khartoum, Sudan, 21st January 2008.
5. Christopher, J., Sarens, G., & Leung, P. (2009). A critical analysis of the independence of the internal audit function: evidence from Australia, Accounting, Auditing & Accountability Journal, 22(2), 200-220. https://doi.org/10.1108/09513570910933942
6. Cohen, A., & Sayag, G. (2010). The effectiveness of internal auditing: an empirical examination of its determinants in Israeli organizations, Australian Accounting Review, 20(3), 296-307. https://doi.org/10.1111/j.1835-2561.2010.00092.x
7. Denzin, N. K., & Lincoln, Y. S. (2000). Handbook of qualitative research (2nd.). London: Sage.
8. Hailemariam, S. (2014). Determinants of Internal Audit Effectiveness in the Public Sector: Case Study in Selected Ethiopian Public Offices, Jimma University, unpublished MSc thesis, Ethiopia. Retrieved from: https://opendocs.ids.ac.uk/opendocs/handle/123456789/5418
9. Khalid, A. A., Haron, H. H., & Masron, T. A. (2017). Relationship between internal Shariah audit characteristics and its effectiveness. Humanomics, 33(2), 221-238.
10. Mansour, A. E. (2012). Framework for Government Internal Audit Profession Strategy in Sudan, Khartoum University Journal of Management Studies, 5(2), 31-48.
11. Ramamoorti, S. (2003). Internal auditing: history, evolution, and prospects. Research opportunities in internal auditing, 1-23.
12. Rittenberg, L. E., Schwieger, B. J., & Johnstone, K. M. (2008). Auditing: A Business Risk Approach, 6th Ed. South-Western Thomson Higher Education, Mason, OH.
13. Sarens, G., & Beelde, I. D. (2006). The relationship between internal audit and senior management: A qualitative analysis of expectations and perceptions, Journal of Auditing, 10(3), 219-41. https://doi.org/10.1111/j.1099-1123.2006.00351.x
14. Smidt, L., Ahmi, A., Steenkamp, L., van der Nest, D. P., & Lubbe, D. (2019). A maturity-level assessment of generalised audit software: Internal audit functions in Australia. Australian Accounting Review, 29(3), 516– 531. https://doi.org/10.1111/auar.12252
15. The Institute of Internal Auditors (IIA), (2016). International Standards for the Professional Practice of Internal Auditing (Standards). Retrieved from: https://na.theiia.org/standardsguidance/Public%20Documents/IPPF-Standards2017.pdf
16. Van Gansberghe, C. N. (2005). Internal audit: Finding its place in public management, the international bank for reconstruction and development, The World Bank, Washington, DC.
17. Yin, R. K. (2009). Case study research: Design and methods (4th Ed). Thousand Oaks, CA: Sage