“Improving Propagation of Echinacea Purpurea and Its Content of Some Active Compounds by Using Tyrosine and Salicylic Acid in Vitro”. Baghdad Science Journal 20, no. 3(Suppl.) (June 20, 2023): 0919. Accessed January 22, 2025. https://bsj.uobaghdad.edu.iq/index.php/BSJ/article/view/7399.