Jefferys, Thomas, -1771. "An authentic plan of the River St. Laurence from Sillery to the fall of Montmorenci, with the operations of the siege of Quebec." Map. London: Thos Jefferys, [1768]. Norman B. Leventhal Map & Education Center, https://collections.leventhalmap.org/search/commonwealth:q524n4636 (accessed April 18, 2024).