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SM U-21 (Germany) (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "SM U-21 (Germany)" in English language version.

refsWebsite
Global rank English rank
4uboat.net
2,553rd place
1,888th place

uboat.net

  • Helgason, Guðmundur. "WWI U-boats: U 21". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 26 July 2014.
  • Helgason, Guðmundur. "WWI U-boat commanders: Otto Hersing (Pour le Mérite)". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 21 December 2014.
  • Helgason, Guðmundur. "WWI U-boat commanders: Friedrich Klein (Friedrich Order (Württemberg))". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 21 December 2014.
  • Helgason, Guðmundur. "Ships hit by U 21". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 21 December 2014.