V. V. Chaipanich, D. L. Roberts, and S. Hasin, “Impact of Ecological Factors on the Distribution of Vanilla siamensis Rolfe ex Downie (Orchidaceae: Vanilloideae) in Tropical Forest at Khao Soi Dao Wildlife Sanctuary, Chantaburi, Thailand”, Thai. Nat. Hist. Mus. J., vol. 13, no. 2, pp. 117–134, Dec. 2019.