Caplan, Richard M. (1982). "The circumstances of the missing biographer or why Watson didn't narrate these four Sherlock Holmes stories". Journal of the American Academy of Dermatology. 6 (6): 1112–1114. doi:10.1016/S0190-9622(82)70095-7. PMID7047594.
Caplan, Richard M. (1982). "The circumstances of the missing biographer or why Watson didn't narrate these four Sherlock Holmes stories". Journal of the American Academy of Dermatology. 6 (6): 1112–1114. doi:10.1016/S0190-9622(82)70095-7. PMID7047594.