Krualee, Sudanai, S Sripeam, S Chuchert, and T Puttakan. 2022. “Effect of Intercropping on Growth and Profit of Oil Palm in Immature Stage”. Songklanakarin Journal of Plant Science 8 (2):73-78. https://www.sjplantscience.com/index.php/ojs/article/view/17.