http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Một số vấn đề chính trị nổi bật ở Liên minh Châu Âu năm 2018 và dự báo năm 2019
Trịnh Thị Hiền, Chử Thị Nhuần, Phạm Văn Phú.