* China: A Commercial and Industrial Handbook (1902)
* Peking to Petersburg: A Journey of the Russian Overland Route (1904)
* Japan and China: Their Present and Future (1904)
* The Fleet and the Empire: A Survey of British Naval Development and its World-wide Consequences (1915)
* The British Empire: A Study of Its Development, Government, and Problems (1916)
* Europe since Waterloo (1919)
* History of the Russo-Japanese War (1920)
* The Birth of the Republic (1923)
* The War of Liberation in the Netherlands, 1813-1814: A Study in Byways of Military History (1923)
* Poland and the Minority Races (1925)
* The Life of His Royal Highness The Duke of Connaught and Strathearn (1929)
* British Diplomacy in the Near East, 1878-1922 (1930)
* The Naval Review: A Quarterly Review of Naval Matters (1930-1931, editor)
* The Naval Annual (1932-1934, editor)
* The Year Book of the League of Nations (1933, editor)
* The World and the League (1933, editor)
* The Geneva Protocol on Arbitration, Security, and Disarmament (1934, editor)
* The Disarmament Convention: A Commentary on the Draft Disarmament Convention Submitted by the Delegations of the United Kingdom, the United States of America, France, and Italy to the General Commission of the Conference for the Reduction and Limitation of Armaments on March 16th, 1933 (1934, editor)
* The League of Nations: Its Aims, Achievements, and Limitations (1934)
* The Handbook of the League of Nations (1935, editor)
* The Covenant of the League of Nations: A Commentary (1935, editor)
* The Problem of the League of Nations (1936)
* The League of Nations: A Guide for Students (1936)
* The League of Nations: A Survey of Its Activities during 1936 (1937, editor)
* The League of Nations: A Survey of Its Activities during 1937 (1938, editor)
* The League of Nations: A Survey of Its Activities during 1938 (1939, editor)
* The League of Nations: Its Life and Work (1940)
Articles and Pamphlets:
* "The Chinese Eastern Railway" (1901)
* "The Siberian Railway" (1902)
* "The Trans-Siberian Railway" (1903)
* "Japanese Expansion" (1904)
* "The Russo-Japanese War" (1905)
* "The Chinese Empire: Its Present and Future" (1906)
* "The British Empire: Its Growth and Development" (1907)
* "The Problems of the British Empire" (1908)
* "The Future of the British Empire" (1909)
* "The Naval Policy of the British Empire" (1910)
* "The British Navy and the Dominions" (1911)
* "The Empire and the War" (1912)
* "The Peace of Europe" (1913)