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5. ^{{cite web |title=Das Menschenschlachthaus: Bilder vom kommenden Krieg |url=http://www.worldcat.org/title/menschenschlachthaus-bilder-vom-kommenden-krieg/oclc/4202541 |website=Worldcat|accessdate=18 June 2018 |language=German |date=1912}}
6. ^{{cite journal |last1=Riva |first1=Michele Augusto |last2=Benedetti |first2=Marta |last3=Cesana |first3=Giancarlo |title=Pandemic Fear and Literature: Observations from Jack London’s The Scarlet Plague |pmc=4193163 |journal=Emerging Infectious Diseases |pages=1753–1757 |doi=10.3201/eid2010.130278 |date=October 2014}}
7. ^{{cite web |title=The Lost World! Mountain that inspired Sir Arthur Conan Doyle's novel |url=http://www.dailymail.co.uk/travel/travel_news/article-2939355/Visit-real-Lost-World-haunting-Venezuelan-mountain-inspired-Sir-Arthur-Conan-Doyle-s-iconic-novel-reached-three-day-trek.html |website=Mail Online |accessdate=18 June 2018}}