APA

Hemingway E., . (1941). For whom the bell tolls. : Penguin Books.

Chicago

Hemingway Ernest, . 1941. For whom the bell tolls. : Penguin Books.

Harvard

Hemingway E., . (1941). For whom the bell tolls. : Penguin Books.

MLA

Hemingway Ernest, . For whom the bell tolls. : Penguin Books. 1941.