http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Thần tốc, táo bạo, bất ngờ' cho đòn tiến công cuối cùng
Trận quyết chiến chiến lược ; Tháng 4/1975; Tháng tổng tiến công và nổi dậy ; Lịch sử