Helgason, Guðmundur. "Ships hit by UB 2". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 4 March 2009.
Helgason, Guðmundur. Helgason, Guðmundur. "Ships hit during WWI: Britannia". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net., Helgason, Guðmundur. "Ships hit during WWI: Edward". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net., Helgason, Guðmundur. "Ships hit during WWI: Laurestina". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net., Helgason, Guðmundur. "Ships hit during WWI: Quivive". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net., Helgason, Guðmundur. "Ships hit during WWI: Welfare". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net., Helgason, Guðmundur. "Ships hit during WWI: Intrepid". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved on 3 March 2009.
Helgason, Guðmundur. "Ships hit during WWI: Miura". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 4 March 2009.
Helgason, Guðmundur. "Ships hit during WWI: Constance". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 4 March 2009.
Helgason, Guðmundur. "Ships hit during WWI: Emanuel". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 4 March 2009.
Helgason, Guðmundur. "Ships hit during WWI: Boy Ernie". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 4 March 2009.
Helgason, Guðmundur. "Ships hit during WWI: Arbonne". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 4 March 2009.