Sajjapong, Wittawas, Kamonwan Jongsomchai, Uratcha Sadjapong, and Pornchai Sooksaen. 2023. “Effects of promoting eating foods containing bitter vegetables on nutritional status in the elderly”. Journal of Associated Medical Sciences 57 (1):135-41. https://he01.tci-thaijo.org/index.php/bulletinAMS/article/view/264413.