Derrick Belanger, Sir Arthur Conan Doyle (2014). “A Study in Terror: Volume 1: Sir Arthur Conan Doyle's Revolutionary Stories of Fear and the Supernatural”, p.215, Andrews UK Limited
Arthur Conan Doyle (2006). “The Hound of the Baskervilles: Another Adventure of Sherlock Holmes, with "The Adventure of the Speckled Band"”, p.236, Broadview Press
Arthur Conan Doyle (2007). “The New Annotated Sherlock Holmes: The Complete Short Stories: The Adventures of Sherlock Holmes and The Memoirs of Sherlock Holmes (Non-slipcased Edition) (Vol. 1) (The Annotated Books)”, p.305, W. W. Norton & Company
Arthur Conan Doyle (2007). “The New Annotated Sherlock Holmes: The Complete Short Stories: The Adventures of Sherlock Holmes and The Memoirs of Sherlock Holmes (Non-slipcased Edition) (Vol. 1) (The Annotated Books)”, p.102, W. W. Norton & Company
Sir Arthur Conan Doyle (2014). “Sherlock Holmes Complete Collection With illustrated Adventures of Sherlock Holmes - 4 Novels, 56 Short Stories and 120+ illustrations”, p.630, Ageless Reads