German submarine U-67 (1940) (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "German submarine U-67 (1940)" in English language version.

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Gröner 1991, p. 68. Gröner, Eric; Jung, Dieter; Maass, Martin (1991). German Warships 1815-1945: U-boats and Mine Warfare Vessels. Vol. 2. Translated by Thomas, Keith; Magowan, Rachel. London: Conway Maritime. ISBN 0-85177-593-4.
Busch & Röll 1999, pp. 116–-117. Busch, Rainer; Röll, Hans-Joachim (1999). Der U-Boot-Krieg, 1939-1945: Deutsche U-Boot-Verluste von September 1939 bis Mai 1945 [German U-boat losses from September 1939 to May 1945] (in German). Vol. IV. Hamburg, Berlin, Bonn: Mittler. ISBN 3-8132-0514-2.

Helgason, Guðmundur. "The Type IXC boat U-67". German U-boats of World War II. Retrieved 3 July 2012.
Helgason, Guðmundur. "Ships hit by U-67". German U-boats of WWII - uboat.net. Retrieved 3 October 2014.