"Sideview"(PDF). Macular Disease Society. Archived from the original(PDF) on 26 April 2018. Retrieved 5 June 2017.
merrisonholmes.com
Bert Coules (3 March 1993). "The Return of Sherlock Holmes". The BBC complete audio Sherlock Holmes. Archived from the original on 29 September 2016. Retrieved 24 January 2020.
"Sideview"(PDF). Macular Disease Society. Archived from the original(PDF) on 26 April 2018. Retrieved 5 June 2017.
Bert Coules (3 March 1993). "The Return of Sherlock Holmes". The BBC complete audio Sherlock Holmes. Archived from the original on 29 September 2016. Retrieved 24 January 2020.