U-21号潜艇 (1913年) (Chinese Wikipedia)

Analysis of information sources in references of the Wikipedia article "U-21号潜艇 (1913年)" in Chinese language version.

refsWebsite

Global rank Chinese rank

14archive.org

6^th place

4^th place

4uboat.net

2,553^rd place

4,064^th place

archive.org

Gray，第44–45页 Gray, Edwyn A. The U-Boat War: 1914–1918. London: L. Cooper. 1994. ISBN 0-85052-405-9.
Gray，第46页 Gray, Edwyn A. The U-Boat War: 1914–1918. London: L. Cooper. 1994. ISBN 0-85052-405-9.
Sondhaus，第33页 Sondhaus, Lawrence. The Great War at Sea: A Naval History of the First World War. Cambridge: Cambridge University Press. 2014. ISBN 978-1-107-03690-1.
Gray，第67–68页 Gray, Edwyn A. The U-Boat War: 1914–1918. London: L. Cooper. 1994. ISBN 0-85052-405-9.
Gray，第78–79页 Gray, Edwyn A. The U-Boat War: 1914–1918. London: L. Cooper. 1994. ISBN 0-85052-405-9.
Gray，第121–122页 Gray, Edwyn A. The U-Boat War: 1914–1918. London: L. Cooper. 1994. ISBN 0-85052-405-9.
Gray，第119–120页 Gray, Edwyn A. The U-Boat War: 1914–1918. London: L. Cooper. 1994. ISBN 0-85052-405-9.
Gray，第123–124页 Gray, Edwyn A. The U-Boat War: 1914–1918. London: L. Cooper. 1994. ISBN 0-85052-405-9.
Paine，第533页 Paine, Lincoln. Ships of the World: An Historical Encyclopedia. Boston: Houghton Mifflin Co. 1997. ISBN 0-395-71556-3.
Gray，第126–128页 Gray, Edwyn A. The U-Boat War: 1914–1918. London: L. Cooper. 1994. ISBN 0-85052-405-9.
Gray，第129页 Gray, Edwyn A. The U-Boat War: 1914–1918. London: L. Cooper. 1994. ISBN 0-85052-405-9.
Gardiner & Gray，第341页 Gardiner, Robert; Gray, Randal (编). Conway's All the World's Fighting Ships: 1906–1921. Annapolis: Naval Institute Press. 1985. ISBN 0-87021-907-3.
Sondhaus，第181页 Sondhaus, Lawrence. The Great War at Sea: A Naval History of the First World War. Cambridge: Cambridge University Press. 2014. ISBN 978-1-107-03690-1.
Gray，第204–205页 Gray, Edwyn A. The U-Boat War: 1914–1918. London: L. Cooper. 1994. ISBN 0-85052-405-9.

uboat.net

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