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Chicago: Arthur Conan Doyle, "Part 1: The Tragedy of Birlstone," Sherlock Holmes: The Valley of Fear Original Sources, accessed June 30, 2025, http://www.originalsources.com/Document.aspx?DocID=2UGP8CUQGK9256H.
MLA: Doyle, Arthur Conan. "Part 1: The Tragedy of Birlstone." Sherlock Holmes: The Valley of Fear, Original Sources. 30 Jun. 2025. http://www.originalsources.com/Document.aspx?DocID=2UGP8CUQGK9256H.
Harvard: Doyle, AC, 'Part 1: The Tragedy of Birlstone' in Sherlock Holmes: The Valley of Fear. Original Sources, retrieved 30 June 2025, from http://www.originalsources.com/Document.aspx?DocID=2UGP8CUQGK9256H.