Columbia subject headings:
Bethlen, Gábor, Prince of Transylvania, 1580-1629.
Hungary--History--Turkish occupation, 1526-1699.
Szekfű, Gyula, 1883-1955. Bethlen Gábor.
Transylvania (Romania)--History.
Harvard subject headings:
Bethlen, Gábor, Prince of Transylvania, 1580-1629.
Szekfű, Gyula, 1883-1955. Bethlen Gabor.
Princeton subject headings: