http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Cuốn sách tập hợp các bài thơ hay trong các tập thơ Từ ấy, Việt Bắc, Gió lộng của nhà thơ Tố Hữu.