Lelesz, Judit, Éva Nagy, and József Csajbók. “The Marigold (Calendula Officinalis L.) Drug Essential Oil Agents Change under Different Fertilization Settings in Small Plot Trial”. Acta Agraria Debreceniensis, no. 70 (October 24, 2016): 57–60. Accessed June 24, 2021. https://ojs.lib.unideb.hu/actaagrar/article/view/1818.