The Hauntings at Yuletide
Blue is the Old Black
You can find articles by dr. Arngrímur in these books:
Paranormal Encounters in Iceland 1150–1400
Margins, Monsters, Deviants Alterities in Old Norse Literature and Culture
Sagas and Eddas
Sledgehammer Judgements from an English Poet
Icelandic Food and Cookery by Nanna Rögnvaldardóttir (mentioned in the episode) is a great source of information and Icelandic cuisine.
The Smartest People In The World
Whose People Are You?
Ragnar Furry Pants and the Sagas
Hear, Smith of Heavens
Troublemaker Valley