Helgason, Guðmundur. "Otaio". Ships hit by U-558 - uboat.net. Retrieved 28 December 2014.
Helgason, Guðmundur. "Vancouver Island". Ships hit by U-558 - uboat.net. Retrieved 28 December 2014.
Helgason, Guðmundur. "W.C. Teagle". Ships hit by U-558 - uboat.net. Retrieved 3 December 2008.
Helgason, Guðmundur. "Erviken". Ships hit by U-558 - uboat.net. Retrieved 3 December 2008.
Helgason, Guðmundur. "Rym". Ships hit by U-558 - uboat.net. Retrieved 3 December 2008.
Helgason, Guðmundur. "The Type VIIC boat U-558". German U-boats of WWII - uboat.net. Retrieved 28 December 2014.
Helgason, Guðmundur. "Anadara". Ships hit by U-558 - uboat.net. Retrieved 28 December 2014.
Helgason, Guðmundur. "Eidanger". Ships hit by U-558 - uboat.net. Retrieved 28 December 2014.Helgason, Guðmundur. "Inverarder". Ships hit by U-558 - uboat.net. Retrieved 28 December 2014.
Helgason, Guðmundur. "Fauna". Ships hit by U-558 - uboat.net. Retrieved 28 December 2014.
Helgason, Guðmundur. "Troisdoc". Ships hit by U-558 - uboat.net. Retrieved 28 December 2014.
Helgason, Guðmundur. "William Boyce Thompson". Ships hit by U-558 - uboat.net. Retrieved 28 December 2014.
Helgason, Guðmundur. "Beatrice". Ships hit by U-558 - uboat.net. Retrieved 28 December 2014.
Helgason, Guðmundur. "Jack". Ships hit by U-558 - uboat.net. Retrieved 28 December 2014.
Helgason, Guðmundur. "Triton". Ships hit by U-558 - uboat.net. Retrieved 28 December 2014.
Helgason, Guðmundur. "Amakura". Ships hit by U-558 - uboat.net. Retrieved 28 December 2014.
Helgason, Guðmundur. "Empire Lugard". Ships hit by U-558 - uboat.net. Retrieved 28 December 2014.Helgason, Guðmundur. "Suriname". Ships hit by U-558 - uboat.net. Retrieved 28 December 2014.
Helgason, Guðmundur. "Vilja". Ships hit by U-558 - uboat.net. Retrieved 28 December 2014.
Helgason, Guðmundur. "Commercial Trader". Ships hit by U-558 - uboat.net. Retrieved 28 December 2014.
Helgason, Guðmundur. "Empire Norseman". Ships hit by U-558 - uboat.net. Retrieved 28 December 2014.
Helgason, Guðmundur. "Ships hit by U-558". German U-boats of WWII - uboat.net. Retrieved 2 February 2014.