http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Nhà xuất bản Thành phố Hồ Chí Minh
Vanessa Jakeman and Clare McDowell; Lê Huy Lâm biên dịch
English language,International english language testing systeme