Cita APA

Williamson, J. G., & Helfferich, K. (1971). Karl Helfferich, 1872 - 1924: Economist, financier, politician. Princeton Univ. Press.

Citación estilo Chicago

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

Cita MLA

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