German submarine U-991 (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "German submarine U-991" in English language version.

refsWebsite

Global rank English rank

8,419^th place

5,782^nd place

2,553^rd place

1,888^th place

low place

uboat.net

Helgason, Guðmundur (1995). "U-991". German U-boats of WWII - uboat.net. Retrieved 7 April 2016.

Hofmann, Markus (23 December 2013). "U-991". Deutsche U-Boote 1935-1945 - u-boot-archiv.de (in German). Retrieved 7 April 2016.