(London, 1973)
Palmer, A. W., Twilight of the Habsburgs: The Life and Times of Emperor Francis Joseph (London, 1994)
Patterson, D. F., «Citizen Peace Initiatives and American Political Culture, 1865–1920», in C. Chatfild and P. van den Dungen (eds.), Peace Movements and Political Culture (Knoxville, 1988), 187–203
Pless, D. F. v. and Chapman-Huston, D., Daisy, Princess of Pless (New York, 1929)
Poincaré, R., Au Service de la France: Neuf Années de Souvenirs, 11 vols (Paris, 1926–74)
Porch, D., «The French Army and the Spirit of the Offensive, 1900–1914», in B. Bond and I. Roy (eds.), War and Society: A Yearbook of Military History (New York, 1975), 117
–, The March to the Marne: Th French Army, 1871–1914 (Cambridge, 1981)
Radziwill, C., Behind the Veil at the Russian Court, by Count Paul Vassili (London, 1913)
Rathenau, W. and Pogge von Strandmann, H., Walther Rathenau, Industrialist, Banker, Intellectual, and Politician: Notes and Diaries, 1907–1922 (Oxford, 1985)
Rathenau, W. (ed.), Briefe (Dresden, 1926)
Redlich, J., Emperor Francis Joseph of Austria: A Biography (New York, 1929)
–, Schicksalsjahre Österreichs, 1908–1919: Das politische Tagebuch Josef Redlichs (Graz, 1953)
Renzi, W. A., In the Shadow of the Sword: Italy's Neutrality and Entrance into the Great War, 1914–1915 (New York, 1987)
Reynolds, M. A., Shattering Empires: The Clash and Collapse of the Ottoman and Russian Empires, 1908–1918 (Cambridge, 2011)
Rich, D. A., The Tsar's Colonels: Professionalism, Strategy, and Subversion in Late Imperial Russia (Cambridge, 1998)
Rich, N., Friedrich von Holstein, Politics and Diplomacy in the Era of Bismarck and Wilhelm II (Cambridge, 1965)
Ridley, J., Bertie: A Life of Edward VII (London, 2012)
Riezler, K., Tagebücher, Aufsätze, Dokumente (Göttingen, 1972)
Ritter, G., The Sword and the Scepter: The Problem of Militarism in Germany, vol. II: The European Powers and the Wilhelminian Empire, 1890–1914 (Coral Gables, 1970)
–, «Zusammenarbeit der Generalstäbe Deutschlands und Österreichs», in C. Hinrichs (ed.), Zur Geschichte und Problematik der Demokratie. Festgabe für Hans Herzfeld, Professor der Neueren Geschichte an der Freien Universität Berlin, Anlässlich seines fünfundsechzigsten Geburtstages Am 22. Juni 1957 (Berlin, 1958), 523–50
Robbins, K., Sir Edward Grey: A Biography of Lord Grey of Fallodon (London, 1971)
Roberts, A., Salisbury: Victorian Titan (London, 1999)
Rogger, H., «Russia in 1914», Journal of Contemporary History, vol. 1, no. 4 (1966), 95–119
Rohkrämer, T., «Heroes and Would-be Heroes: Veterans» and Reservists» Associations in Imperial Germany», in M. F. Boemeke, R. Chickering, and S. Förster (eds.),