Pinpradit, N., C. Khrootmuang, and K. Polboon. “Learning society network in the local of the northeast : the state of development”. Asia-Pacific Journal of Science and Technology, vol. 15, no. 7, Apr. 2017, pp. 679-88, https://so01.tci-thaijo.org/index.php/APST/article/view/83253.