Soltanbeigi, Amir, y Hasan Maral. «AGRONOMIC YIELD AND ESSENTIAL OIL PROPERTIES OF PURPLE CONEFLOWER (Echinacea Purpurea L. MOENCH) WITH DIFFERENT NUTRIENT APPLICATIONS». Chilean Journal of Agricultural & Animal Sciences 38, no. 2 (agosto 29, 2022): 164-175. Accedido mayo 4, 2024. https://revistas.udec.cl/index.php/chjaas/article/view/7237.