Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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