Understanding Life in the Borderlands۔ صفحہ: 174۔ In the map shown in figure 7.2,... used as a reference at the Congress of Berlin - clear praise for its perceived objectivity.
jstor.org
Richard G. Weeks Jr, "Peter Shuvalov and the Congress of Berlin: A Reinterpretation." Journal of Modern History 51.S1 (1979): D1055-D1070. online
Otto Pflanze, Bismarck and the Development of Germany, Volume II: The Period of Consolidation, 1871-1880 (1990) pp. 415–442 online.