APA

Palmer A., . (1979). The Penguin Dictionary of twentieth Century history 1900 - 1978. London: Penguin Books.

Chicago

Palmer Alan, . 1979. The Penguin Dictionary of twentieth Century history 1900 - 1978. London: Penguin Books.

Harvard

Palmer A., . (1979). The Penguin Dictionary of twentieth Century history 1900 - 1978. London: Penguin Books.

MLA

Palmer Alan, . The Penguin Dictionary of twentieth Century history 1900 - 1978. London: Penguin Books. 1979.