Petpornprapas, E., and M. Lotrakul. “Postpartum Depression: Its Relationship to Childbirth and Child Health at Ramathibodi Hospital”. Journal of the Psychiatric Association of Thailand, vol. 54, no. 1, Mar. 2013, pp. 29-36, https://he01.tci-thaijo.org/index.php/JPAT/article/view/7523.