Cita APA (7a ed.)

Calleo, D. P. (1980). The German problem reconsidered: Germany and the world order, 1870 to the present. Cambridge University Press.

Cita Chicago Style (17a ed.)

Calleo, David P. The German Problem Reconsidered: Germany and the World Order, 1870 to the Present. Cambridge: Cambridge University Press, 1980.

Cita MLA (9a ed.)

Calleo, David P. The German Problem Reconsidered: Germany and the World Order, 1870 to the Present. Cambridge University Press, 1980.