Nguyen Thi Ngan. “KHOAI CHAU DISTRICT - HUNG YEN PROVINCE PEOPLE CONTRIBUTION IN THE RESISTANCE AGAINST FRENCH COLOMIAL INVASION (1946 – 1954)”. UTEHY Journal of Applied Science and Technology, Vol. 14, July 2017, pp. 121-4, http://jst.utehy.edu.vn/index.php/jst/article/view/199.