Mehra, Reeti, et al. “Qualitative Human Chorionic Gonadotropin Testing in Vaginal Fluid for Diagnosis of Preterm Premature Rupture of Membrane”. Nepal Journal of Obstetrics and Gynaecology, vol. 4, no. 2, July 2011, pp. 28-31, https://nepjol.info./index.php/NJOG/article/view/5043.