Cita APA (7th ed.)
Thornton, A. P. (1977). Imperialism in the twentieth century. University of Minnesota Press.
Cita Chicago (17th ed.)
Thornton, A. P. Imperialism in the Twentieth Century. Minneapolis: University of Minnesota Press, 1977.
Cita MLA (9th ed.)
Thornton, A. P. Imperialism in the Twentieth Century. University of Minnesota Press, 1977.
Atenció: Aquestes cites poden no estar 100% correctes.