Big Bertha (Simple English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Big Bertha" in Simple English language version.

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archive.org

Gerhard Taube (1981). Die schwersten Steilfeuer-Geschütze, 1914-1945: Geheimwaffen "Dicke Berta" und "Karl". Motorbuch Verlag. p. 30. ISBN 978-3-87943-811-2.
Terry Crowdy (2007). Military misdemeanors: corruption, incompetence, lust and downright stupidity. Osprey Publishing. p. 137. ISBN 978-1-84603-148-9.