Shahida Magsi, Shaista Lashari, Rukhsana Shaikh, Inayat Magsi, Sonia Gul Qureshi, “Unexplained Infertility: Comparison of Efficacy of Letrozole and Clomiphene Citrate”, Pakistan Journal of Medical & Health Sciences, vol. 16, no. 03, p. 109, Apr. 2022.