APA

Barraclough G., . (1964). An introduction to contemporary history. New York: Basic Books.

Chicago

Barraclough Geoffrey, . 1964. An introduction to contemporary history. New York: Basic Books.

Harvard

Barraclough G., . (1964). An introduction to contemporary history. New York: Basic Books.

MLA

Barraclough Geoffrey, . An introduction to contemporary history. New York: Basic Books. 1964.