Sansaneeyavanich, A. “Oral Health Status and Treatment Needs of Students Aged 12 Years and 18 Years in Bangkok Metropolis: A Comparative Study in the Year 1991 and 2000”. Vajira Medical Journal : Journal of Urban Medicine, vol. 45, no. 1, Sept. 2011, pp. 21-29, https://he02.tci-thaijo.org/index.php/VMED/article/view/137.