Chumthong, A. ., K. . Nooprom, S. . Apiratikorn, K. . Nicomrat, and R. . Chiarawipa. “Effects of Different Organic Fertilizers on Growth and Yield of Robusta Coffee Intercropped With Rubber Trees”. Songklanakarin Journal of Plant Science, vol. 10, no. 2, Dec. 2023, pp. 90-97, https://www.sjplantscience.com/index.php/ojs/article/view/98.