APA

Morgenthau H. J., . (1962). Politics in the twentieth century. Estados Unidos: University of CHicago.

Chicago

Morgenthau Hans J, . 1962. Politics in the twentieth century. Estados Unidos: University of CHicago.

Harvard

Morgenthau H. J., . (1962). Politics in the twentieth century. Estados Unidos: University of CHicago.

MLA

Morgenthau Hans J, . Politics in the twentieth century. Estados Unidos: University of CHicago. 1962.