German submarine U-230 (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "German submarine U-230" 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. "The Type VII Uboat U-230". German U-boats of WWII - uboat.net. Retrieved 1 October 2015.
Helgason, Guðmundur. "War Patrols by German U-boat U-230". German U-boats of WWII - uboat.net. Retrieved 1 April 2013.
Helgason, Guðmundur. "U-230's 1st patrol". German U-boats of WWII - uboat.net. Retrieved 1 October 2015.
Helgason, Guðmundur. "Group Burggraf". German U-boats of WWII - uboat.net. Retrieved 1 October 2015.
Helgason, Guðmundur. "Group Westmark". German U-boats of WWII - uboat.net. Retrieved 1 October 2015.
Helgason, Guðmundur. "Ships hit by U-230". German U-boats of WWII - uboat.net. Retrieved 1 October 2015.
Helgason, Guðmundur. "Group Drossel". German U-boats of WWII - uboat.net. Retrieved 1 October 2015.
Helgason, Guðmundur. "U-230's third patrol". German U-boats of WWII - uboat.net. Retrieved 1 October 2015.
grid CA7353:Helgason, Guðmundur. "U-230 third patrol". German U-boats of WWII - uboat.net. Retrieved 1 October 2015.
grid CA7355:Helgason, Guðmundur. "U-566's 10th patrol". German U-boats of WWII - uboat.net. Retrieved 1 October 2015.
Helgason, Guðmundur. "U-230's fourth patrol". German U-boats of WWII - uboat.net. Retrieved 1 October 2015.
Helgason, Guðmundur. "U-230's fifth patrol". German U-boats of WWII - uboat.net. Retrieved 1 October 2015.
Helgason, Guðmundur. "Ships hit by U-230". German U-boats of WWII - uboat.net. Retrieved 26 December 2014.