Columbia subject headings:
Cassel, Gustav, 1866-1945.
Harms, Bernhard, 1876-1939.
Schumpeter, Joseph A., 1883-1950.
Harvard subject headings:
Cassel, Gustav, 1866-1945.
Harms, Bernhard, 1876-1939.
Schumpeter, Joseph A., 1883-1950.
Princeton subject headings:
Cassel, Gustav, 1866-1945.
Harms, Bernhard, 1876-1939.
Schumpeter, Joseph A., 1883-1950.