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.133, BoD - Books on Demand
Oscar Wilde (2013). “The Picture of Dorian Gray: The Story of a Fashionable Young Man Who Sells His Soul for Eternal Youth and Beauty (Beloved Books Edition)”, p.17, Lulu Press, Inc
Gaston Leroux (2016). “The Phantom of the Opera & The Mystery of the Yellow Room (Mystery Classics): The Ultimate Gothic Romance Mystery and One of the First Locked-Room Crime Mysteries”, p.195, e-artnow