German submarine U-57 (1938) (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "German submarine U-57 (1938)" in English language version.

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books.google.com

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. ISBN 0-85177-593-4.

Helgason, Guðmundur. "The Type IIC boat U-57". German U-boats of WWII – uboat.net. Retrieved 7 December 2014.
Helgason, Guðmundur. "Ships hit by U-57". German U-boats of WWII – uboat.net. Retrieved 8 November 2012.
Helgason, Guðmundur. "Ships hit by U-57". German U-boats of WWII – uboat.net. Retrieved 7 December 2014.