APA

Warburg J. P., . (1954). The United States in a changing world. New York: Putman.

Chicago

Warburg James Paul, . 1954. The United States in a changing world. New York: Putman.

Harvard

Warburg J. P., . (1954). The United States in a changing world. New York: Putman.

MLA

Warburg James Paul, . The United States in a changing world. New York: Putman. 1954.