Arif, Nadia, et al. “A STUDY ON THE COMPARISON OF SAFETY AND EFFICACY OF POST PARTUM INTRAUTERINE CONTRACEPTIVE DEVICE (PPIUCD) WITH INTERVAL INTRAUTERINE CONTRACEPTIVE DEVICE”. Pakistan Armed Forces Medical Journal, vol. 70, no. 5, Oct. 2020, pp. 1419-23, https://pafmj.org/PAFMJ/article/view/5576.