Prayitno, T. A., R. Widyorini, and G. Lukmandaru. “Chemical Variation of Five Natural Extracts by Non-Polar Solvent”. 2021. Maderas-Cienc Tecnol, vol. 23, Nov. 2020, pp. 1-12, https://revistas.ubiobio.cl/index.php/MCT/article/view/4321.