http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Sách bao gồm những bài tập môn Giáo dục công dan của lớp 6 giúp học sinh học tốt môn học này thông qua các bài tập.
Đặng Thuý Anh (chủ biên), Đỗ Thúy Hằng, Nguyễn Văn Lũy
Study and teaching (Elementary),Problems, exercises