Thornton, A. P. (1977). Imperialism in the twentieth century. University of Minnesota Press.
芝加哥风格引文Thornton, A. P. Imperialism in the Twentieth Century. Minneapolis: University of Minnesota Press, 1977.
MLA引文Thornton, A. P. Imperialism in the Twentieth Century. University of Minnesota Press, 1977.
警告：这些引文格式不一定是100％准确.