APA

Coolidge A. C., . (1912). The United States as a world power. New York: Macmillan.

Chicago

Coolidge Archibald Cary, . 1912. The United States as a world power. New York: Macmillan.

Harvard

Coolidge A. C., . (1912). The United States as a world power. New York: Macmillan.

MLA

Coolidge Archibald Cary, . The United States as a world power. New York: Macmillan. 1912.