APA (7th ed.) Citation

Langer, W. L. (1960). The diplomacy of imperialism, 1890-1902 (2nd ed., with supplementary bibliographies.). Knopf.

Chicago Style (17th ed.) Citation

Langer, William Leonard. The Diplomacy of Imperialism, 1890-1902. 2nd ed., with supplementary bibliographies. New York: Knopf, 1960.

MLA (9th ed.) Citation

Langer, William Leonard. The Diplomacy of Imperialism, 1890-1902. 2nd ed., with supplementary bibliographies. Knopf, 1960.