German submarine U-42 (1939) (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "German submarine U-42 (1939)" in English language version.

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books.google.com

Helgason, Guðmundur. "The Type IXA boat U-42". German U-boats of World War II - uboat.net. Retrieved 13 April 2010.
Helgason, Guðmundur. "Type IXA". German U-boats of WWII - uboat.net. Retrieved 3 April 2010.
Helgason, Guðmundur. "Patrol info for U-42 (First patrol)". German U-boats of World War II - uboat.net. Retrieved 15 April 2010.
Helgason, Guðmundur. "Stonepool (Steam merchant)". German U-boats of WWII - uboat.net.
Helgason, Guðmundur. "U-boat Losses – 1939". German U-boats of World War II - uboat.net. Retrieved 15 April 2010.
Helgason, Guðmundur. "Ships hit by U-42". German U-boats of World War II - uboat.net. Retrieved 26 December 2013.

"U-42 Type IXA". ubootwaffe.net. Archived from the original on 24 May 2012. Retrieved 30 April 2010.

"U-42 Type IXA". ubootwaffe.net. Archived from the original on 24 May 2012. Retrieved 30 April 2010.