ŞAHİN, R. V., and B. . COŞGE ŞENKAL. “Determination of Antioxidant Activities of Echinacea Purpurea (L.) Moench. Plant Extracts Harvested at Different Times”. ISPEC Journal of Agricultural Sciences, vol. 8, no. 4, Dec. 2024, pp. 926-37, doi:10.5281/zenodo.13352969.