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Sources:

Thomas, Roger, Pavlov’s Dogs “Dripped Saliva at the Sound of a Bell” - Commentary on Littman on Pavlov-Bell, Psycoloquy, Volume 5, Issue 80, 1994, http://www.cogsci.ecs.soton.ac.uk/cgi/psyc/newpsy?article=5.80

Littman, Richard, Bekhterev and Watson Rang Pavlov’s Bell: a Reply to Catania’s Query, Psycoloquy, Volume 5, Issue 49, 1994, http://www.cogsci.ecs.soton.ac.uk/cgi/psyc/newpsy?5.49

Ivan Pavlov Biographical, The Novel Prize, https://www.nobelprize.org/prizes/medicine/1904/pavlov/biographical/

Butler-Bowdown, Tom, You have probably heard of Pavlov and his famous dogs, but who was he and what was his contribution to psychology? 50 Classics Series, http://www.butler-bowdon.com/ip-pavlov---conditioned-reflexes.html

Ivan Pavlov (1849-1936), Institute of Experimental Medicine, St. Petersburg, https://web.archive.org/web/20050426171314/http://www.iemrams.spb.ru:8100/english/pavlov.htm

Specter, Michael, Drool: Ivan pavlov’s Real Quest, The New Yorker, November 17, 2014, https://www.newyorker.com/magazine/2014/11/24/drool

Grimes, A.C, The Truth About Pavlov and His Dogs, Grunge, February 11, 2020, https://www.grunge.com/188174/the-truth-about-pavlov-and-his-dogs/

Todes, Daniel, Ivan Pavlov in 22 Surprising Facts, Oxford University Press Blog, November 21, 2014, https://blog.oup.com/2014/11/ivan-pavlov-surprising-facts/

Ivan Secherov, Russia InfoCentre, http://www.russia-ic.com/people/education_science/s/150/