APA

Raja'a Y. A., Noman T. A., al Warafi A. K., al Mashraki N. A. & al Yosofi A. M. (20030502). Khat chewing is a risk factor of duodenal ulcer. : Eastern Mediterranean health journal = La revue de sante de la Mediterranee orientale = al-Majallah al-sihhiyah li-sharq al-mutawassit.

Chicago

Raja'a Y A, Noman T A, al Warafi A K, al Mashraki N A and al Yosofi A M. 20030502. Khat chewing is a risk factor of duodenal ulcer. : Eastern Mediterranean health journal = La revue de sante de la Mediterranee orientale = al-Majallah al-sihhiyah li-sharq al-mutawassit.

Harvard

Raja'a Y. A., Noman T. A., al Warafi A. K., al Mashraki N. A. and al Yosofi A. M. (20030502). Khat chewing is a risk factor of duodenal ulcer. : Eastern Mediterranean health journal = La revue de sante de la Mediterranee orientale = al-Majallah al-sihhiyah li-sharq al-mutawassit.

MLA

Raja'a Y A, Noman T A, al Warafi A K, al Mashraki N A and al Yosofi A M. Khat chewing is a risk factor of duodenal ulcer. : Eastern Mediterranean health journal = La revue de sante de la Mediterranee orientale = al-Majallah al-sihhiyah li-sharq al-mutawassit. 20030502.