On September 1, 1939 the German Wehrmacht would begin their invasion of Poland. But before we get there, we need to look at Interwar Poland. During this episode we will look at developments in Polish internal politics and foreign relations.

Sources: 
- Case White: The Invasion of Poland 1939 by Rober Forczyk
- Poland 1939: The Outbreak of World War II by Roger Moorhouse
- Appeasement: Chamberlain, Hitler, Churchill and the Road to War by Tim Bouverie
- The Origins of the Second World War: An International Perspective Edited by Frank McDonough
- The Polish Campaign 1939 by Steven Zaloga and Victor Madej
- The Foreign Policy of Jozef Pilsudski and Jozef Beck, 1926-1939: Misconceptions and Interpretations by Anna M. Cienciala
- The French Government and the Danzig Crisis: The Italian Dimension by P.R. Stafford
- Reflections from Rumania and Beyond: Marshal Smigly-Rydz in Exile by Stanley S. Seidner
- Macht Arbeit Frei? Chapter: The War against Poland and the Beginning of German Economic Policy in the Occupied Territory by Witold Wojciech Medykowski
- Poland Between the Wars, 1918-1939 Edited by Peter D. Stachura
- Poland's Preparation for World War Two by Michael Alfred Peszke
- The Rebirth and Progress of the Polish Military During the Interwar Years by Jacek Czarnecki
- The Eastern Pact, 1933-1935: A Last Attempt at European Co-operation by Lisanne Radice (1977)
- The Lights that Failed: European International History 1919-1933 by Zara Steiner
- Agreement of Mutual Assistance between the United Kingdom and Poland, August 25, 1939.
- Blitzkrieg Unleashed by Richard Hargreaves
- The Great Powers and Poland: From Versailles to Yalta by Jan Karski
- The History of the Panzerwaffe Volume 1: 1939-42 by Thomas Anderson
- September Storm: The German Invasion of Poland by Gordon Rottman & Stephen Andrew
- Britain and Poland, 1939-1943: The Betrayed Ally by Anita J. Prazmowska
- March 1939: The British Guarantee to Poland - A Study in the Continuity of British Foreign Policy by Simon Newman (1976)
- Poland 1939: The birth of Blitzkrieg by Steven J. Zaloga
- The Rise and Fall of the Third Reich by William Shirer
- Various Documents from the British Cabinet Papers, particularly CAB 55/19/15, CAB 65/1, CAB 65/3, and CAB 66/1
- Documents on German Foreign Policy 1918-1945
- Reflections from Rumania and Beyond: Marshal Smigly-Rydz in Exile by Stanley S. Seidner
- The British War Blue Book: Documents Concerning German-Polish Relations and the Outbreak of Hostilities Between Great Britain and Germany on September 3, 1939
- The French Yellow Book: Diplomatic Documents (1938-1939)
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