APA

Buell A. A., . (1939). Poland : key to Europe. - Third edition. New York ; London: Alfred A. Knopf.

Chicago

Buell Alfred A, . 1939. Poland : key to Europe. - Third edition. New York ; London: Alfred A. Knopf.

Harvard

Buell A. A., . (1939). Poland : key to Europe. - Third edition. New York ; London: Alfred A. Knopf.

MLA

Buell Alfred A, . Poland : key to Europe. - Third edition. New York ; London: Alfred A. Knopf. 1939.