Na Nakorn, W., Chaymeang, C., and Chaison, C. “Diversity and evenness of indigenous vegetables in Nakhon Si Thammarat province, Thailand”. International Journal of Agricultural Technology, vol. 14, no. 7, Dec. 2018, pp. 1483-94, https://li04.tci-thaijo.org/index.php/IJAT/article/view/8657.