Wiwat Wangcharoen, Tipvanna Ngarmsak, and Brian H. Wilkinson. “Suitability of Using Herbs as Functional Ingredients in Thai Commercial Snacks”. Agriculture and Natural Resources, vol. 36, no. 4, Dec. 2002, pp. 426-34, https://li01.tci-thaijo.org/index.php/anres/article/view/242776.