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HNLMS O 21 (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "HNLMS O 21" in English language version.

refsWebsite
Global rank English rank
2dutchsubmarines.com
low place
low place
1uboat.net
2,553rd place
1,888th place

dutchsubmarines.com

  • "Dutch Submarines: The O 21 submarine class". dutchsubmarines.com. 2012. Retrieved 23 July 2013.
  • "Dutch Submarines: The submarine O 21". dutchsubmarines.com. 2012. Retrieved 23 July 2013.

uboat.net

  • Helgason, Guðmundur (2013). "HNMS O 21". uboat.net. Retrieved 23 July 2013.