http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Sách chuyên khảo Hệ thống nông nghiệp Việt Nam: Lý luận và thực tiễn
Phạm Văn Hiền (chủ biên); Trần Danh Thìn; Phạm Thị Minh Tâm; Mai Văn Quyền