http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Izdatelstvo na Bʺlgarskata akademiâ na naukite
Stefan V. Vasilev ; Bʺlgarska Akademiâ na Naukite. Institut po Filosofiâ "Akad. Todor Pavlov".