Jukić, Huska, et al. “Antioxidant and Prooxidant Activities of Phenolic Compounds of the Extracts of Echinacea Purpurea (L.)”. Bulletin of Chemists and Technologists of Bosnia and Herzegovina, vol. 44, June 2015, pp. 43-52, https://glashem.pmf.unsa.ba/index.php/bctbh/article/view/147.