Helgason, Guðmundur. "Ships hit during WWI: Dacia". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 2010-11-13.
Helgason, Guðmundur. "Ships hit during WWI: Kanguroo". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 2010-11-13.
Helgason, Guðmundur. "Ships hit during WWI: Surprise". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 2010-11-13.