Prapaisri Thamviriyavong ประไพศรี ธรรมวิริยะวงศ์. “The Attitude Towards the Persistence of the Voluntary Insured Persons (Article 40) of Social Security Office, Pathumthani Province”. Dusit Thani College Journal 12, no. 1 (April 4, 2018): 296–341. Accessed May 20, 2024. https://so01.tci-thaijo.org/index.php/journaldtc/article/view/118320.