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.203, Andrews UK Limited
1908 Of the final moments of the 1908 Olympic marathon, in which the Italian runner Dorando Pietri had to be helped over the finishing line and was thus disqualified. Quoted in Colin Jarman The Guinness Dictionary of Sports Quotations (1990).
Arthur Conan Doyle (2016). “Sherlock Holmes - The Short Stories (Book 2): The Return of Sherlock Holmes (Part 2), His Last Bow, The Case-Book of Sherlock Holmes”, p.37, BoD - Books on Demand
Sir Arthur Conan Doyle (2014). “Sherlock Holmes Complete Collection With illustrated Adventures of Sherlock Holmes - 4 Novels, 56 Short Stories and 120+ illustrations”, p.1667, Ageless Reads
Arthur Conan Doyle (2016). “Sherlock Holmes - The Novels: A Study in Scarlet, The Sign of the Four, The Hound of the Baskervilles, The Valley of Fear”, p.356, BoD - Books on Demand
Sir Arthur Conan Doyle (2014). “Sherlock Holmes Complete Collection With illustrated Adventures of Sherlock Holmes - 4 Novels, 56 Short Stories and 120+ illustrations”, p.874, Ageless Reads