Columbia subject headings:
Bernstein, Eduard, 1850-1932.
Communist revisionism--History--19th century.
Luxemburg, Rosa, 1871-1919.
Socialism--Germany--History--19th century.
Harvard subject headings:
Bernstein, Eduard, 1850-1932.
Communist revisionism--History--19th century.
Luxemburg, Rosa, 1871-1919
Socialism--Germany--19th century.
Socialism--Germany--History--19th century
Princeton subject headings:
Bernstein, Eduard, 1850-1932.
Communist revisionism--History--19th century.
Luxemburg, Rosa, 1871-1919.
Socialism--Germany--History--19th century.