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
Arthur Conan Doyle (2014). “The Complete Sherlock Holmes (Illustrated): All 4 Novels and 56 Stories with More Than 480 Illustrations”, p.567, Top Five Books LLC
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