Ansari, Asmat Kamal, et al. “ROLE OF CORTICOTROPHIN RELEASING HORMONE IN DETERMINING THE LENGTH OF GESTATION: PLACENTAL CLOCK”. Pakistan Journal of Physiology, vol. 7, no. 1, June 2011, pp. 23-25, https://pjp.pps.org.pk/index.php/PJP/article/view/775.