3General Statistic Office of Vietnam.'Socio-Economic Situation in 2012'. http://www.gso.gov.vn/default_en.aspx?tabid=508<emID=13500 . 2012
4Chau Thi Hai."Trade Activities of the Hoa along the Sino-Vietnamese Border"[].Where China Meets Southeast Asia:Social and Cultural Change in the Border Regions.1999
