จารุนนทรากุล ท., and ทองสุขดี ร. . “Safe Zone : Barrier to Developmental Potentiality of a Child With Multiple Disabilities”. Sikkhana, vol. 6, no. 7, June 2019, pp. 1-15, https://so05.tci-thaijo.org/index.php/JSikkhana/article/view/241009.