Ayesha Mukhtar, Farzana Kazmi, Farah Rehana. 2013. “Comparison of Vaginal Isosorbide Mononitrate With Prostaglandin E2 for Pre-Induction Cervical Ripening at Term”. Journal of Rawalpindi Medical College 17 (1). http://journalrmc.com/index.php/JRMC/article/view/527.