Wongkrajang, Y., T. Vongratanastit, and K. Atisook. “Toxicity Study of Orthosiphon grandifolus”. Journal of Basic and Applied Pharmacology, vol. 12, no. 2, July 2015, pp. 63-69, https://li01.tci-thaijo.org/index.php/JBAP/article/view/36410.