Kunhirunbowon, S. “A STUDY ON THE PROPERTIES OF SAND AT THAP YAI CHIANG MOUNTAIN AREA FOR GREEN SAND CASING”. Life Sciences and Environment Journal, vol. 18, no. 2, Oct. 2017, pp. 360-6, https://ph01.tci-thaijo.org/index.php/psru/article/view/77315.