- ^ Facsimile of the 1st US edition (1905)
- ^ Boström, Mattias (2018). From Holmes to Sherlock. Mysterious Press. p. 123. ISBN 978-0-8021-2789-1.
- ^ "The Diogenes Club: A brief note about the Return of Sherlock Holmes". diogenes-club.com.
- ^ Barnes, Alan (2011). Sherlock Holmes on Screen. Titan Books. pp. 13–14, 64–66, 104–105. ISBN 9780857687760.
- ^ Dickerson, Ian (2020). Sherlock Holmes and His Adventures on American Radio. BearManor Media. p. 49. ISBN 978-1629335087.
- ^ Dickerson, Ian (2020). Sherlock Holmes and His Adventures on American Radio. BearManor Media. pp. 89–90, 95–96, 102. ISBN 978-1629335087.
- ^ Barnes, Alan (2011). Sherlock Holmes on Screen. Titan Books. pp. 21–23, 41, 114–115, 152–153. ISBN 9780857687760.
- ^ Bert Coules. "The Return of Sherlock Holmes". The BBC complete audio Sherlock Holmes. Retrieved 5 December 2020.
- ^ Wright, Stewart (30 April 2019). "The Classic Adventures of Sherlock Holmes: Broadcast Log" (PDF). Old-Time Radio. Retrieved 5 December 2020.
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