三人征兆 (Chinese Wikipedia)

The Sign of Three. BBC Sherlock. Sherlockology. [2017-10-22]. （原始内容存档于2017-10-14）.
Sherlock S3E2: The Sign of Three completes filming. BBC Sherlock. Sherlockology. 2013-05-23 [2017-10-22]. （原始内容存档于2017-10-14）.
Wellington Barracks. BBC Sherlock. Sherlockology. [2017-11-30]. （原始内容存档于2018-03-04）.
St James’s Park. BBC Sherlock. Sherlockology. [2017-11-30]. （原始内容存档于2017-12-01）.

tab.co.uk

bristol.tab.co.uk

See Goldney Hall on Sherlock Tonight. Bristol.tab.co.uk. 2014-01-05 [2017-10-22]. （原始内容存档于2014-01-06）.

telegraph.co.uk

"Sherlock is most viewed BBC iPlayer show of 2014" （页面存档备份，存于互联网档案馆） Telegraph 2014 10 6
"Sherlock: The Sign of Three, season 3, episode 2, review" （页面存档备份，存于互联网档案馆） Telegraph 2014 1 5

theguardian.com

"Has Sherlock jumped the shark?" （页面存档备份，存于互联网档案馆） The Guardian 2014 1 6

thepunkeffect.com

"Foxhounder Films: Sherlock Season 3: "The Sign of Three" Review" （页面存档备份，存于互联网档案馆） The Punk Effect 2014 1 29

tvtropes.org

Recap: Sherlock S 03 E 02 The Sign Of Three. [2014-10-28]. （原始内容存档于2014-10-28）.

web.archive.org

SHERLOCK – The Sign of Three. BBFC. [2017-10-14]. （原始内容存档于2017-10-14）.
The Sign of Three. BBC Sherlock. Sherlockology. [2017-10-22]. （原始内容存档于2017-10-14）.
Sherlock series 3: Doctor Who and Ripper Street director Colm McCarthy to helm The Sign of Three. The Radio Times. 2013-04-15 [2017-10-22]. （原始内容存档于2017-10-14）.
Sherlock S3E2: The Sign of Three completes filming. BBC Sherlock. Sherlockology. 2013-05-23 [2017-10-22]. （原始内容存档于2017-10-14）.
See Goldney Hall on Sherlock Tonight. Bristol.tab.co.uk. 2014-01-05 [2017-10-22]. （原始内容存档于2014-01-06）.
St James’s Park. BBC Sherlock. Sherlockology. [2017-11-30]. （原始内容存档于2017-12-01）.
Radish, Christina. Producer Sue Vertue Talks SHERLOCK, Her Reaction to Hearing Season 3’s Story Ideas, Fan Reactions, Casting Decisions, Shooting on Location and More. Collider. 2014-02-04 [2017-11-30]. （原始内容存档于2017-10-14）.
Sherlock series 3, episode 2: The Sign of Three – 10 references you may have missed. Metro. 2014-01-06 [2018-05-30]. （原始内容存档于2019-04-01）.
Recap: Sherlock S 03 E 02 The Sign Of Three. [2014-10-28]. （原始内容存档于2014-10-28）.
"7 Canonical References in The Sign of Three" （页面存档备份，存于互联网档案馆）《Wordpress.com》 2014 1 6
"Sherlock is most viewed BBC iPlayer show of 2014" （页面存档备份，存于互联网档案馆） Telegraph 2014 10 6
"Sherlock: The Sign of Three, season 3, episode 2, review" （页面存档备份，存于互联网档案馆） Telegraph 2014 1 5
"Sherlock series 3 episode 2 review: The Sign Of Three" （页面存档备份，存于互联网档案馆） Den of Geek 2014 1 5
"Sherlock 'The Sign of Three' TV review: Bromance is in the air" （页面存档备份，存于互联网档案馆） Independent 2014 1 5
"Foxhounder Films: Sherlock Season 3: "The Sign of Three" Review" （页面存档备份，存于互联网档案馆） The Punk Effect 2014 1 29
"Has Sherlock jumped the shark?" （页面存档备份，存于互联网档案馆） The Guardian 2014 1 6

webcitation.org

Wellington Barracks. BBC Sherlock. Sherlockology. [2017-11-30]. （原始内容存档于2018-03-04）.