http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
1. English vocabulary in use : elementary / Michael McCarthy, Felicity O'Dell. -- 2. English vocabulry in use : pre-intermediate & intermediate / Stuart Redmen. -- 3. English vocabulary in use : upper-intermediate / Michael McCarthy, Felicity O'Dell. -- 4. English vocabulary in use : advanced / Michael McCarthy, Felicity O'Dell