Heimskringla - The Chronicles of the Kings of Norway - Originally written in Old Norse, 1225 A.D., by the poet and historian Snorri Sturluson. English translation by Samuel Laing (London, 1844). - http://sunsite.berkeley.edu/OMACL/Heimskringla/
The Heathen Temple at Uppsala - Abstracted from Adam of Bremen, Gesta Hammaburgensis Ecclesiae Pontificum. - http://www.pitt.edu/~dash/uppsala.html
Ertha, the Germanic Earth Goddess - By Tacitus, excerp from "The Works of Tacitus", The Oxford Translation. - http://www.pitt.edu/~dash/ertha.html
Ecclesiastical History of the English Nation - By Bede. L.C. Jane translation. E-text at the Internet Medieval Sourcebook. Each book in its own file, with links to the others. - http://www.fordham.edu/halsall/basis/bede-book1.html
The Danish History, Books I - IX - Originally written in Latin in the early years of the 13th Century A.D. by the Danish historian Saxo Gramaticus, translated to English by Oliver Elton. - http://sunsite.berkeley.edu/OMACL/DanishHistory/
The Anglo-Saxon Chronicles - Complete modern English translation published by the Online Medieval and Classical Library (OMACL). - http://sunsite.berkeley.edu/OMACL/Anglo/