http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Passages 2 : An upper-level multi-skills course (student's book)
Jack C.Richards; Chuck Sandy; Nguyễn Văn Phước
Jack C.Richards, Chuck Sandy ; Nguyễn Văn Phước (chú giải)