Cita APA (7a ed.)

Thornton, A. P. (1977). Imperialism in the twentieth century. University of Minnesota Press.

Cita Chicago Style (17a ed.)

Thornton, A. P. Imperialism in the Twentieth Century. Minneapolis: University of Minnesota Press, 1977.

Cita MLA (9a ed.)

Thornton, A. P. Imperialism in the Twentieth Century. University of Minnesota Press, 1977.