Cơ, Nguyễn Ngọc, Viet Nam

• Tạp chí Nghiên cứu Lịch sử No. 3 (2008) - Articles
  Process of Exploring, Exploiting and Mining of Metal Ores in Cao Bang During the French Colonial Period
  Abstract  PDF (Vietnamese)
• Tạp chí Nghiên cứu Lịch sử No. 4 (2008) - Articles
  Process of Exploring, Exploiting and Mining of Metal Ores in Cao Bang During the French Colonial Period
  Abstract  PDF (Vietnamese)
• Tạp chí Nghiên cứu Lịch sử No. 4 (2009) - Articles
  Preliminary Research of Currency and Financial State in Southern Vietnam, 1954-1975
  Abstract  PDF (Vietnamese)