Somboonsuke, B., P. Phitthayaphinant, and A. Ratanachai. “Health Status of Household Laborer in Para-Rubber Plantations in Songkhla Province”. Kasetsart Journal of Social Sciences, vol. 37, no. 3, Dec. 2016, pp. 243-54, https://so04.tci-thaijo.org/index.php/kjss/article/view/243034.