The Codex Wormianus or AM 242 fol. is an Icelandic vellumcodex dating from the mid-14th century. It contains an edition of the Prose Edda and some additional material on poetics, including the First Grammatical Treatise. It is the only manuscript to preserve the Rígsþula.
^Bernharðsson, Haraldur (2015). "Stjórn, the Old Testament in Old Norse". In Driscoll, Matthew James; Óskarsdóttir, Svanhildur (eds.). 66 Manuscripts from the Arnamagnæan Collection. Copenhagen and Reykjavík: The Arnamagnaean Institute, Department of Nordic Research, University of Copenhagen; The Árni Magnússon Institute for Icelandic Studies; Museum Tusculanum Press, University of Copenhagen. p. 158. ISBN978-87-635-4264-7.