PHAM, Quoc Hung, et al. “NUTRITIONAL ANEMIA IN PREGNANT WOMEN AT 6-16 GESTATIONAL WEEK IN HA NAM”. Vietnam Journal of Nutrition &Amp; Food, vol. 13, no. 5, June 2017, pp. 75-82, https://tapchidinhduongthucpham.org.vn/index.php/jfns/article/view/529.