Chalermwut Noisopa, Benjaphorn Prapagdee, Chalie Navanugraha, and Rungjarat Hutacharoen. “Effects of Bio-Extracts on the Growth of Chinese Kale”. Agriculture and Natural Resources, vol. 44, no. 5, Oct. 2010, pp. 808-15, https://li01.tci-thaijo.org/index.php/anres/article/view/244993.