^ abcdeHelgason, Guðmundur. "WWI U-boats: UC 7". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 20 February 2009.
^Helgason, Guðmundur. "WWI U-boat commanders: Franz Wäger". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 9 February 2015.
^Helgason, Guðmundur. "WWI U-boat commanders: Georg Haag". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 9 February 2015.
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