Tahir, F., M. Badawi, A. Nuqali, Y. Katib, I. M. Siddiqui, F. Edris, E. Madani, M. Morad, O. Taibah, and Y. Al-Ghamdi. “The Effect of Rectal Progesterone on Latency Period As Well As Maternal and Prenatal Outcome Between 24 to 33 Weeks”. International Journal of Clinical Trials, vol. 2, no. 4, Nov. 2015, pp. 97-101, doi:10.18203/2349-3259.ijct20151239.