APA (7th ed.) Citation
Thornton, A. P. (1977). Imperialism in the twentieth century. University of Minnesota Press.
Chicago Style (17th ed.) Citation
Thornton, A. P. Imperialism in the Twentieth Century. Minneapolis: University of Minnesota Press, 1977.
MLA (9th ed.) Citation
Thornton, A. P. Imperialism in the Twentieth Century. University of Minnesota Press, 1977.
Warning: These citations may not always be 100% accurate.