N. Abid, I. “Bacterial Contamination of Iraqi Paper Currency in Circulation in Al-Nasiriyah City, Thi – Qar Province”. University of Thi-Qar Journal of Science, Vol. 6, no. 2, Apr. 2019, pp. 121-6, https://www.jsci.utq.edu.iq/index.php/main/article/view/8.