German submarine U-68 (1940) (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "German submarine U-68 (1940)" in English language version.

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bbc.co.uk

"Record dive rescues $50m wartime silver from ocean floor". BBC News. 15 April 2015. Retrieved 15 April 2015.

google.com

Gröner 1991, p. 68. 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. ISBN 0-85177-593-4.

uboat.net

Helgason, Guðmundur. "The Type IXC boat U-68". German U-boats of WWII - uboat.net. Retrieved 7 December 2014.
Helgason, Guðmundur. "Ships hit by U-68". German U-boats of WWII - uboat.net. Retrieved 23 November 2012.