Thongthong, Ph.D., T., and A. Wacharawitoon. “A Guideline for development of construction price indices in Thailand: Residential construction price index”. Engineering and Applied Science Research, vol. 29, no. 1-2, Feb. 2013, pp. 65-86, https://ph01.tci-thaijo.org/index.php/easr/article/view/6525.