http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Vũ Tự Lập, Nguyễn Trọng Lân, Trịnh Sanh
ĐTTS ghi : Viện hàn lâm khoa học Liên Xô địa lý