M. S. Mohamed, H. H. Saad, and M. G. Abd El Khalek, “Daily Consumption of Marjoram Oil Improve the Health Status of Patients with Asthma”, Pak. J. Nutr., vol. 7, no. 2, pp. 312–316, Feb. 2008, doi: 10.3923/pjn.2008.312.316.