Citazione Stile APA (7a Edizione)

Williamson, D. G. (2009). Poland betrayed: The Nazi-Soviet invasions 1939. Pen & Sword Military.

Citazione stile Chigago Style (17a edizione)

Williamson, David Graham. Poland Betrayed: The Nazi-Soviet Invasions 1939. Barnsley: Pen & Sword Military, 2009.

Citatione MLA (9a ed.)

Williamson, David Graham. Poland Betrayed: The Nazi-Soviet Invasions 1939. Pen & Sword Military, 2009.