Khakwani, M., R. Parveen, S. Yousaf, and A. U. Tareen. “Efficacy of Letrozole Versus Clomiphene Citrate on Ovulation Induction in Patients With Polycystic Ovarian Syndrome”. Pakistan Journal of Medical Sciences, Vol. 38, no. 5, May 2022, doi:10.12669/pjms.38.5.5565.