German submarine U-1 (1935) (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "German submarine U-1 (1935)" in English language version.

refsWebsite

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1books.google.com

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books.google.com

Rössler 1979, p. 99. Rössler, Eberhard (1979). Die deutschen U-Boote und ihre Werften: eine Bilddokumentation über den deutschen U-Bootbau; in zwei Bänden (in German). Vol. I. Munich: Bernard & Graefe. ISBN 3-7637-5213-7.

uboat.net

Helgason, Guðmundur. "The Type IIA U-boat U-1". German U-boats of WWII - uboat.net. Retrieved 18 August 2020.