German submarine U-63 (1939) (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "German submarine U-63 (1939)" in English language version.

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Gröner 1991, pp. 39–40. 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 Press. ISBN 0-85177-593-4.

uboat.net

Helgason, Guðmundur. "War Patrols by German U-boat U-63". German U-boats of World War II - uboat.net.
Helgason, Guðmundur. "The Type IIC boat U-63". German U-boats of WWII - uboat.net. Retrieved 6 December 2014.
It is alleged one POW Walter Kurt Reich escaped see U-Boat Forum 20 June 2018
Helgason, Guðmundur. "Ships hit by U-63". German U-boats of WWII - uboat.net. Retrieved 17 November 2012.