Langbehn, Volker Max.German Colonialism, Visual Culture, and Modern Memory In Routledge studies in modern European history ;; 13; Variation: Routledge studies in modern European history ;; 13. New York: Routledge, 2010.
Vandervort, Bruce. "War and Imperial Expansion." In The Cambridge History of War, edited by Roger Chickering, Dennis Showalter and Hans van de Ven, 69-93. Vol. 4: War and the Modern World. Cambridge: Cambridge University Press, 2012.