Manual, A., J. Ab Hamid, S. Jawahir, A. Amer Nordin, I. Ab Rahim, S. N. Mohd Noh, N. E. Abdul Mutalib, D. S. Rata Mohan, I. Mohamed Razif, and M. Y. Ibrahim. “Healthcare Utilisation Inequality and the Hidden Burden of Out-of-Pocket Expenditures in Sabah”. Borneo Journal of Medical Sciences (BJMS), vol. 20, no. 3, Sept. 2026, pp. 367-79, https://jurcon.ums.edu.my/ojums/index.php/bjms/article/view/6445.