Charlotte Bronte, Emily Bronte, Anne Bronte (2009). “The Bronte Sisters: Three Novels: Jane Eyre; Wuthering Heights; and Agnes Grey (Penguin Classics Deluxe Edition)”, p.681, Penguin
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.1483, Ageless Reads