Cita APA (7a ed.)

Williamson, J. G. (1971). Karl Helfferich, 1872-1924: Economist, Financier, Politician. Princeton University Press.

Cita Chicago Style (17a ed.)

Williamson, John G. Karl Helfferich, 1872-1924: Economist, Financier, Politician. Princeton, New Jersey: Princeton University Press, 1971.

Cita MLA (8a ed.)

Williamson, John G. Karl Helfferich, 1872-1924: Economist, Financier, Politician. Princeton University Press, 1971.