พรกาญจนวงศ์ พ. (2019) “District Health System Operation Model Health Zone 12 of Years 2015 – 2017”, Region 11 Medical Journal, 33(1), pp. 59–72. available at: https://he02.tci-thaijo.org/index.php/Reg11MedJ/article/view/188287 (accessed: 20 September 2026).