Nygaard, Simon. “Otherworldly Beings in the Pre-Christian North: Tribal, Chiefdom, and Archaic Religion and the Use of Cultural Evolutionary Theory”. Temenos - Nordic Journal for the Study of Religion 58, no. 1 (June 17, 2022): 67–89. Accessed September 19, 2024. https://journal.fi/temenos/article/view/102495.