Panisaya Atijitta และ Kullatip Satararuji. (2020) The development guidelines of communication network management among elderly schools in Chiang Rai Province and Kalasin Province. National Institute of Development Administration:ม.ป.ท.Panisaya Atijitta และ Kullatip Satararuji. 2020. The development guidelines of communication network management among elderly schools in Chiang Rai Province and Kalasin Province. ม.ป.ท.:National Institute of Development Administration;Panisaya Atijitta และ Kullatip Satararuji. The development guidelines of communication network management among elderly schools in Chiang Rai Province and Kalasin Province. ม.ป.ท.:National Institute of Development Administration, 2020. Print.