Albertin, Lothar (1969). "Haußmann, Conrad". Neue Deutsche Biographie 8 [Online-Version]. pp. 130–131. Retrieved 30 March 2023.
doi.org
Röhl, John C. G. (2013). Wilhelm II. Into the Abyss of War and Exile, 1900–1941. Translated by Bridge, Roy; de Bellaigue, Sheila. Cambridge, UK: Cambridge University Press. p. 683. doi:10.1017/CBO9781139046275. ISBN978-1-139-04627-5.