Jate Sathornkich, Krisada Sangsing, Sornprach Thanisawanyangkura, and Jessada Phattaralerphong. “Estimation of Rubber Tree Canopy Structure Using a Photographic Method”. Agriculture and Natural Resources 44, no. 1 (February 28, 2010): 24–34. Accessed April 27, 2024. https://li01.tci-thaijo.org/index.php/anres/article/view/244877.