APA

Posen D., . (1994). Always change a losing game. Toronto: Key Porter Books.

Chicago

Posen David, . 1994. Always change a losing game. Toronto: Key Porter Books.

Harvard

Posen D., . (1994). Always change a losing game. Toronto: Key Porter Books.

MLA

Posen David, . Always change a losing game. Toronto: Key Porter Books. 1994.