http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Dân số, tài nguyên, môi trường và chất lượng cuộc sống
Sách hướng dẫn về các lĩnh vực sư phạm và cơ sở kiến thức của Giáo dục dân số