Hobson, John A.Imperialism. University of Michigan Press, 1965. Classic study on imperialism, originally published in 1902.
Mackenzie, John M., ed.Imperialism and Popular Culture. Manchester University Press, 1986, 1998. Collection of essays that addresses British imperialism, popular culture, and propaganda from 1860 to 1950.
Said, Edward W.Culture and Imperialism. Knopf, 1993, 1997. Analyzes imperialism through the lens of British, French, and American literature.
Smith, Bonnie G.Imperialism: A History in Documents. Oxford University Press, 2000. A comprehensive overview of modern imperialism. For high school readers.