Sawanee Sathornviriyapong, Chayan Picheansoonthon, Rawat Tiasakul, Suppachai Tiyaworanant, and Vichai Reutrakul. 2007. “Botanical Origin and Identification of Krai-Krue Herbal Plant”. Agriculture and Natural Resources 41 (3). Bangkok, Thailand:420-32. https://li01.tci-thaijo.org/index.php/anres/article/view/244261.