โรจนพิทยากร วิวัฒน์. “Indirect Age Adjusted Death Rate for Areas With Limited Age-Specific Data”. Journal of Health Science of Thailand 31, no. 4 (August 26, 2022): 584–586. Accessed December 8, 2025. https://www.thaidj.org/index.php/JHS/article/view/12548.