Amel Naji Wadi, Zainab Mahmood Abdulla, and Hadi Kareem Dahaam. 2015. “Identification Study to Determine Some Active Substances In Marjoram Plant Extracts ”. Journal of Madenat Alelem University College 7 (2), 27-34. http://116.203.176.164/index.php/JMAUC/article/view/147.