APA

Beer K. E., . (1961). The U. S. A. answers: a guide to understanding. New York: U. S. and World Publications.

Chicago

Beer Kenneth E, . 1961. The U. S. A. answers: a guide to understanding. New York: U. S. and World Publications.

Harvard

Beer K. E., . (1961). The U. S. A. answers: a guide to understanding. New York: U. S. and World Publications.

MLA

Beer Kenneth E, . The U. S. A. answers: a guide to understanding. New York: U. S. and World Publications. 1961.