Kongyu, S., P. Thammawijaya, A. Lukebua, S. Phumiamorn, and S. Iamsirithaworn. “Prevalence of Protective Immunity for Diphtheria, Measles and Rubella Among Myanmar, Cambodian and Laos Migrant Workers in Thailand”. Journal of Health Science of Thailand, vol. 27, no. 5, Oct. 2018, pp. 772-8, https://thaidj.org/index.php/JHS/article/view/5074.