Tolong jelaskan mengenai Catatan dari Pakta Non-Agresi Jerman–Polandia

Piotr Stefan Wandycz, The twilight of French eastern alliances. 1926–1936. French-czechoslovak-polish relations from Locarno to the remilitarization of the Rheinland., Princeton University Press, 1988 (republished in 2001). ISBN 1-59740-055-6.

Anna M. Cienciala, "The Foreign Policy of Józef Piłsudski and Józef Beck, 1926-1939: Misconceptions and Interpretations,""  The Polish Review (2011) 56#1 pp. 111–151 in JSTOR