http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Sơ cấp, trung cấp, nâng cao và chuyên sâu: Giáo trình hướng dẫn sử dụng Excel đầy đủ và chuyên sâu nhất dùng cho Excel 5.0 for Windows 3.1 và Excel 7.0 for Windows 95
excel ( computer programs ),programming languages ( electronic computers )