Rafiqi, A., Yodi, G., Mustika, T. M., Rahmah, S. F., Hutabarat, E. S. O., Marliani, N., Aisyah, S. I., Kurniatin, P. A., Galingging, R. Y., and Nurcholis, W. “Effect of potassium fertilizer application on total phenolic level, flavonoids, and the antioxidant activity of the Purslane (Portulaca oleracea)”. International Journal of Agricultural Technology, vol. 21, no. 1, Jan. 2025, pp. 205-16, https://li04.tci-thaijo.org/index.php/IJAT/article/view/4154.