Theananansuk, M., and T. Lertbunnaphong. “Postpartum Weight Retention in Thai Singleton Pregnant Women with Normal Pre-pregnancy Body Mass Index”. Thai Journal of Obstetrics and Gynaecology, vol. 16, no. 4, Apr. 2017, pp. 221-6, https://he02.tci-thaijo.org/index.php/tjog/article/view/82237.