Wangwibulkit, M. and Vajrodaya, S. (2016) “Ex-situ propagation of Pogostemon helferi (Hook. f.) Press using tissue culture and a hydroponics system”, Agriculture and Natural Resources. Bangkok, Thailand, 50(1), pp. 20–25. available at: https://li01.tci-thaijo.org/index.php/anres/article/view/243860 (accessed: 27 August 2026).