Columbia subject headings:
Slavs, Southern--History--Sources.
Slavs, Western--History--Sources.
Slavs--History--Sources.
Harvard subject headings:
Slavs, Southern--History
Slavs, Western--History.
Slavs--History--Sources.
Princeton subject headings:
Slavs, Southern--History--Sources.
Slavs, Western--History--Sources.
Slavs--History--Sources.