German submarine U-34 (1936) (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "German submarine U-34 (1936)" in English language version.

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books.google.com

Gröner 1991, pp. 43–44. Gröner, Eric; Jung, Dieter; Maass, Martin (1991). German Warships 1815-1945: U-boats and Mine Warfare Vessels. Vol. 2. Translated by Thomas, Keith; Magowan, Rachel. London: Conway Maritime Press. ISBN 0-85177-593-4.

Helgason, Guðmundur. "The Type VIIA boat U-34". German U-boats of WWII - uboat.net. Retrieved 19 December 2009.
Helgason, Guðmundur. "War Patrols by German U-boat U-34". German U-boats of WWII - uboat.net. Retrieved 19 December 2009.
Helgason, Guðmundur. "Operation Ursula" and the sinking of the submarine C-3". German U-boats of WWII - uboat.net. Retrieved 3 March 2015.
Helgason, Guðmundur. "Ships hit by U-34". German U-boats of WWII - uboat.net.
Helgason, Guðmundur. "The Type VIIA boat U-34". German U-boats of WWII - uboat.net.