Kokkeadtikul, Chalermchai. 2019. “Directions and Challenges in the Negotiation of the Telecom Trade in Services Agreement (TiSA) the Digital Economy Era”. NBTC Journal 3 (3). Bangkok, Thailand:328-49. https://so04.tci-thaijo.org/index.php/NBTC_Journal/article/view/212377.