- ^ Klinger, Leslie (ed.). The New Annotated Sherlock Holmes, Volume III (New York: W. W. Norton, 2006). p. 631. ISBN 978-0393058000
- ^ Doyle, Arthur Conan (October 1979). John Murray (ed.). The Sherlock Holmes Omnibus (2nd Illustrated ed.). ISBN 978-0719536915.
- ^ Smith, Daniel (2014) [2009]. The Sherlock Holmes Companion: An Elementary Guide (Updated ed.). Aurum Press. p. 158. ISBN 978-1-78131-404-3.
- ^ Cawthorne, Nigel (2011). A Brief History of Sherlock Holmes. Running Press. pp. 101, 107. ISBN 978-0762444083.
- ^ Lauterbach, Edward S. (1 January 1994). "The Oxford Sherlock Holmes: A Review Essay". English Literature in Transition, 1880–1920. 37 (4): 502–508. ISSN 1559-2715.
- ^ Eyles, Alan (1986). Sherlock Holmes: A Centenary Celebration. Harper & Row. p. 130. ISBN 0-06-015620-1.
- ^ Eyles, Alan (1986). Sherlock Holmes: A Centenary Celebration. Harper & Row. p. 133. ISBN 0-06-015620-1.
- ^ Dickerson, Ian (2019). Sherlock Holmes and His Adventures on American Radio. BearManor Media. p. 49. ISBN 978-1629335087.
- ^ De Waal, Ronald Burt (1974). The World Bibliography of Sherlock Holmes. Bramhall House. p. 388. ISBN 0-517-217597.
- ^ "Murder for Christmas: The Valley of Fear". BBC Genome: Radio Times. BBC. 2020. Retrieved 19 June 2020.
- ^ Bert Coules. "The Valley of Fear". The BBC complete audio Sherlock Holmes. Retrieved 12 December 2016.
- ^ "58A. The Valley of Fear, Part One". Imagination Theatre. 2020. Retrieved 19 June 2020. (Roles specified in the end credits.)
- ^ "Oxford Playscripts: The Valley of Fear". Oxford University Press. Retrieved 28 September 2018.
- ^ Adrian Flynn adaptation of The Valley of Fear. Oxford University Press. 2004. ISBN 978-0-19-832085-2.
- ^ "The Valley of Fear". Blackeyed Theatre. 2022.
- ^ "Sherlock Holmes: The Valley of Fear review – an elegant last adventure". Guardian. 2022.
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