Lähteet:
Árnason, Jón. Icelandic Legends: https://babel.hathitrust.org/cgi/pt?id=inu.39000005835256&seq=1
(gryla)
https://www.youtube.com/watch?v=vfWUorR8D60&t=219s
https://inlus.org/gryla-and-jolakotturinn-the-christmas-cat/
https://mjolnir.fi/joulunoita-akka-nimeltaan-gryla/
https://lyricstranslate.com/en/jolakottinn-christmas-cat.html
https://forvo.com/search/j%C3%B3lak%C3%B6tturinn/
https://www.diva-portal.org/smash/get/diva2:681828/FULLTEXT01.pdf
https://grapevine.is/news/2018/11/27/christmas-cat-cost-causes-controversy/
https://www.inspiredbyiceland.com/life/13-icelandic-christmas-traditions
https://en.wikipedia.org/wiki/Icelandic_Christmas_folklore
https://bustravel.is/iceland-culture/evil-icelandic-yule-cat
https://monster.fandom.com/wiki/Yule_Cat
https://en.wikipedia.org/wiki/Dimmuborgir
https://www.northiceland.is/en/place/viti
https://www.bbc.com/travel/article/20150212-iceland-where-the-devil-landed
https://en.wikipedia.org/wiki/Volcanism_of_Iceland
https://fi.wikipedia.org/wiki/Islanti
https://en.wikipedia.org/wiki/M%C3%BDvatn
https://guidetoiceland.is/travel-iceland/drive/myvatn
https://guidetoiceland.is/travel-iceland/drive/dimmuborgir
https://fi.wikipedia.org/wiki/Proosa-Edda
https://mysticiceland.com/frightening-christmas-story/
https://www.interesly.com/terrifying-man-eating-christmas-cat/
https://videnskab.dk/kultur-samfund/vikingerne-tog-katte-med-paa-deres-rejser/
https://en.wikipedia.org/wiki/Nonnebakken
https://fi.wikipedia.org/wiki/%C3%9Atgar%C3%B0a-Loki
https://fi.wikipedia.org/wiki/Maailmank%C3%A4%C3%A4rme
https://www.lifeinnorway.net/viking-cats/
https://www.reddit.com/r/Norse/comments/9vukzx/who_invented_the_names_bygul_and_trjegul/
https://berloga-workshop.com/blog/71-bygul-and-trjegul.html
https://fi.wikipedia.org/wiki/Freija
https://skjalden.com/vikings-sailed-with-their-cats-across-europe/
https://playiceland.is/dogs-cats-and-reptiles-in-iceland-your-questions-answered/
https://www.smithsonianmag.com/travel/illegal-in-iceland-180957521/
https://skjalden.com/vikings-sailed-with-their-cats-across-europe/