Bayar, Ülkü, G. Mungan, M. Başaran, S. Kıran, V. Akbulut, and M. Can. “Effects of Metformin on Menstrual Cyclicity in Women With Polycystic Ovary Syndrome”. Gynecology Obstetrics &Amp; Reproductive Medicine, vol. 12, no. 2, Aug. 2006, pp. 116-20, https://gorm.com.tr/index.php/GORM/article/view/582.