German submarine U-221 (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "German submarine U-221" in English language version.

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books.google.com

Franks, Norman L.R. (1997). Dark sky, deep water. Lanham, Maryland: Rowman & Littlefield. p. 94. ISBN 978-1442232853. Retrieved 6 August 2023.

uboat.net

Helgason, Guðmundur. "The Type VIIC boat U-221". German U-boats of WWII - uboat.net. Retrieved 9 December 2014.
Helgason, Guðmundur. "Ships hit by U-221". German U-boats of WWII - uboat.net. Retrieved 26 December 2014.

worldcat.org

search.worldcat.org

Kemp 1999, p. 147. Kemp, Paul (1999). U-boats destroyed : German submarine losses in the World Wars. London: Arms & Armour. ISBN 1-85409-515-3. OCLC 43972253.