Kavalcová, Petra, Judita Bystrická, Pavol Trebichalský, Miriama Kopernická, Miroslava Hrstková, and Marianna Lenková. 2015. “Content of Total Polyphenols and Antioxidant Activity in Selected Varieties of Onion (Allium Cepa L.)”. Potravinarstvo Slovak Journal of Food Sciences 9 (1):494-500. https://doi.org/10.5219/524.