http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Tiêu chuẩn Nhà nước : Máy nông nghiệp. Máy nghiền thức ăn gia súc: TCVN 3625- 81/ TCVN 3627- 81