Works

• Imperialism and Social Reform: English Social-Imperial Thought, 1895–1914 (1960).
• Jamaican Blood and Victorian Conscience: The Governor Eyre Controversy (1962).
• Occasional Papers of T. R. Malthus (edited with an introduction, 1963).
• The Rise of Free Trade Imperialism: Classical Political Economy, the Empire of Free Trade and Imperialism, 1750–1850 (1970).
• Élie Halévy
  Élie Halévy
  Élie Halévy was a French philosopher and historian who wrote studies of the British utilitarians, a history of 19th-century England and the acclaimed book of essays, Era of Tyrannies.-Biography:...
  
  , The Birth of Methodism (translated and with an introduction by Semmel, 1971).
• The Methodist Revolution (1973).
• Marxism and the Science of War (1981).
• John Stuart Mill and the Pursuit of Virtue (1984).
• Liberalism and Naval Strategy: Ideology, Interest and Sea Power during the Pax Britannica (1986).
• The Liberal Ideal and the Demons of Empire: Theories of Imperialism from Adam Smith to Lenin (1993).
• George Eliot and the Politics of National Inheritance (1994).