http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Giáo trình hệ thống mạng máy tính CCNA
Nguyễn Hồng Sơn chủ biên ; Hoàng Đức Hải, Nguyễn Tam Trung ... [et al.] hiệu đính
Communication,Internet ( computer network),Network analysis