- Redmond, Christopher (2009). "The Case-Book of Sherlock Holmes". Sherlock Holmes Handbook (Second ed.). Dundurn. pp. 34–36. ISBN 978-1-77070-592-0. Retrieved 16 February 2018 – via Google Books.
- Pugh, Brian W (2011). A Chronology of the Life of Arthur Conan Doyle. Andrews UK. ISBN 978-1-78092-199-0. Retrieved 16 February 2018 – via Google Books.
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