Heidari M, Chaharmahali AA, Matinfard M. Design and Validation of a Native Conceptual Model for Evaluating and Improving Internal Audit Performance in the Iranian Petrochemical Industry Using a Mixed-Methods Approach. BMF OPEN [Internet]. 2024 Dec. 10 [cited 2025 Dec. 5];1(6):184-95. Available from: https://bmfopen.com/index.php/bmfopen/article/view/359