APA

Langer W. L., . (1935). The diplomacy of imperialism, 1890-1902. New York: Knopf.

Chicago

Langer William L, . 1935. The diplomacy of imperialism, 1890-1902. New York: Knopf.

Harvard

Langer W. L., . (1935). The diplomacy of imperialism, 1890-1902. New York: Knopf.

MLA

Langer William L, . The diplomacy of imperialism, 1890-1902. New York: Knopf. 1935.