Press file for "His Last Bow" and "The Sign of the Four" by Sir Arthur Conan Doyle, 1962-1963, Acc.13328/217. Further papers of John Murray, publishers., Acc.13328. National Library of Scotland Archives and Manuscripts Division. https://nlssb.as.atlas-sys.com/repositories/2/archival_objects/137950 Accessed September 23, 2024.