http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Harpercollins từ điển về chính quyền và chính trị Hoa Kỳ = The HarperCollins dictionary American Government abd politics
Kho thông tin về chính quyền và chính trị cấp liên bang, bang và địa phương = A wealth of information on National, State and local government and politics
Jay M. Shafritz ; Thế Hùng ... [et al.] dịch