U-139级潜艇 (Chinese Wikipedia)

Analysis of information sources in references of the Wikipedia article "U-139级潜艇" in Chinese language version.

refsWebsite

Global rank Chinese rank

6^th place

4^th place

2,553^rd place

4,064^th place

archive.org

Halpern，第433頁. Halpern, Paul S. A Naval History of World War I. Annapolis, Maryland: Naval Institute Press. 1994. ISBN 1-55750-352-4.

uboat.net

Helgason, Guðmundur. WWI U-boats: U 141. German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. [2021-12-24].