เล็กเฟื่องฟู พ. and นิยมศิลป์ ก. (2008) “Evaluation of 24 hours urinary fluoride excretion of children aged 4-5 years participating in the milk fluoridation programme, Bangkok”, Thai Dental Public Health Journal. Bangkok, Thailand, 13(5), pp. 34–48. available at: https://he02.tci-thaijo.org/index.php/ThDPHJo/article/view/179378 (accessed: 28 August 2026).