Fitzgerald, Jill. “A Petersen Type ‘M’ Sword in the Naval Academy’s Collections: Viking History Meets the Modern Navy”. The Northern Mariner / Le marin du nord 33, no. 3-4 (June 20, 2024): 445–464. Accessed December 21, 2024. https://tnm.journals.yorku.ca/index.php/default/article/view/1163.