APA

Welles S., . (1943). The world of the four freedoms. New York: Columbia University Press.

Chicago

Welles Sumner, . 1943. The world of the four freedoms. New York: Columbia University Press.

Harvard

Welles S., . (1943). The world of the four freedoms. New York: Columbia University Press.

MLA

Welles Sumner, . The world of the four freedoms. New York: Columbia University Press. 1943.