Somboonsuke, Buncha, Purawich Phitthayaphinant, and Apinya Ratanachai. 2016. “Health status of household laborer in para-rubber plantations in Songkhla province”. Kasetsart Journal of Social Sciences 37 (3):243-54. https://so04.tci-thaijo.org/index.php/kjss/article/view/243034.