Simpson, D. A., J. A. N. Parnell, P. Chantaranothai, and D. J. Middleton. “The Royal Botanic Gardens Kew”. Thai Forest Bulletin (Botany), no. 23, Dec. 2014, pp. 50-61, https://li01.tci-thaijo.org/index.php/ThaiForestBulletin/article/view/25053.