Παραπομπή APA

Lietheim, G. (1972). Europe in the Twentieth Century. Weidenfeld.

Παραπομπή Chicago Style

Lietheim, George. Europe in the Twentieth Century. London: Weidenfeld, 1972.

Παραπομπή MLA

Lietheim, George. Europe in the Twentieth Century. Weidenfeld, 1972.