“The Sagaman and Oral Literature: The Icelandic Traditions of Hjörleifr inn kvensami and Geirmundr heljarskinn”, in Comparative Research on Oral Traditions: A Memorial for Milman Parry, Columbus, Ohio: Slavica, 1987, p. 395-423.
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“Warlocks, Varlots and Valkyries: A Prolegomenon to the Development of North Sea Witchcraft Terminology”, Cosmos, vol. 17, p. 59-81, 2001.
“The Supernatural and the fornaldarsögur: The Case of Ketils saga hængs”, in Fornaldarsagaerne. Myter og virkelighed. Studier i de oldislandske fornaldarsögur Norðurlanda, Copenhagen: Museum Tusculanum Forlag . Københavns Universitet, 2009, p. 281-98. Website
Witchcraft and Magic in the Nordic Middle Ages. Philadelphia: University of Pennsylvania Press, 2011. Website

