German submarine U-91 (1941) (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "German submarine U-91 (1941)" in English language version.

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books.google.com

Gröner 1991, pp. 43–46. 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. "HMCS Ottawa (H 60) (Destroyer)". German U-boats of WWII - uboat.net. Retrieved 19 February 2010.
Helgason, Guðmundur. "Patrol of U-boat U-91 from 11 Feb 1943 to 29 Mar 1943". German U-boats of WWII - uboat.net. Retrieved 19 February 2010.
Helgason, Guðmundur. "Ships hit by U-91". German U-boats of WWII - uboat.net. Retrieved 26 December 2014.