Promchuea, Sujittra, Ornrat Wongsri, Krerkchai Thanarak, Surakitti Srikul, Suvimol Kolasuek, Chumpol Chawana, Yingniyom Jindadach, and Tuenjit Petchrrun. “A New Hybrid Oil Palm Variety: DOA Surat Thani9”. Thai Agricultural Research Journal 44, no. 2 (August 19, 2026): 116–128. accessed September 3, 2026. https://li01.tci-thaijo.org/index.php/thaiagriculturalresearch/article/view/269819.