Supapvanich, Suriyan, Yenjit Raruang, and Surassawadee Promyou. 2024. “Impact of chilling stress on quality and bioactive compounds in young and mature leaves of kratom [Mitragyna speciosa (Korth.) Havil.]”. Agriculture and Natural Resources 58 (5). Bangkok, Thailand:593–602. https://li01.tci-thaijo.org/index.php/anres/article/view/266208.