German submarine U-40 (1938) (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "German submarine U-40 (1938)" in English language version.

refsWebsite

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1^st place

uboat.net

Helgason, Guðmundur. "The Type IXA boat U-40". German U-boats of WWII - uboat.net. Retrieved 3 April 2010.
Helgason, Guðmundur. "Type IXA". German U-boats of WWII - uboat.net. Retrieved 1 April 2010.
Helgason, Guðmundur. "Patrol info for U-40 (First patrol)". German U-boats of WWII - uboat.net. Retrieved 2 May 2010.
Helgason, Guðmundur. "Patrol info for U-40 (Second patrol)". German U-boats of WWII - uboat.net. Retrieved 2 May 2010.

"Submarine Casualties Booklet". U.S. Naval Submarine School. 1966. Archived from the original on 27 July 2011. Retrieved 8 September 2009.{{cite web}}: CS1 maint: unfit URL (link)