Shoop, Robert L. “Alastair Mars, Unbroken. The Story of a Submarine by Robert L. Shoop”. The Northern Mariner / Le marin du nord 32, no. 3 (May 29, 2023): 434–436. Accessed November 23, 2024. https://tnm.journals.yorku.ca/index.php/default/article/view/1027.