John Emsley, The Elements of Murder: A History of Poison (Oxford University Press, 2005).
Rob Iliffe, Newton: A Very Short Introduction (Oxford University Press, 2007).
Gale E. Christianson, Isaac Newton: Lives and Legacies (Oxford University Press, 2005).
Eleanor Herman, The Royal Art of Poison: Filthy Palaces, Fatal Cosmetics, Deadly Medicine, and Murder Most Foul (St. Martin's Press, 2018).
“Czechs,” Encyclopedia of Cleveland History, Case Western Reserve University, https://case.edu/ech/articles/c/czechs.
Steve Shukis, Poisoned: Chicago 1907, a Corrupt System, an Accused Killer, and the Crusade to Save Him (TitleTown Publishing, 2014).
“A Historical Look at Czech Chicagoland,” Chicagoland Czech-American Community Center, http://www.chicagocacc.org/the-historical-czech-chicagoland.
“History of Pilsen,” WTTW—My Neighborhood, https://interactive.wttw.com/my-neighborhood/pilsen/history.
Alicia Cozine, “Czechs and Bohemians,” Encyclopedia of Chicago, Chicago Historical Society, http://www.encyclopedia.chicagohistory.org/pages/153.html.
“BABY AS WITNESS TELLS OF TRAGEDY,” Chicago Daily Tribune, 12 July 1907, p. 3.
“BILLIK A CONFESSED FAKIR,” Chicago Daily Tribune, 17 July 1907, p.5.
“WOMEN DUPES OF BILLIK,” Chicago Daily Tribune, 11 Dec 1906, p. 3.
“‘Herman Billik Must Die’: Whiting’s Own Palm Reader, Hypnotist, and… Murderer?” Hoosier State Chronicles: Indiana’s Digital Newspaper Program, 31 October 2016, https://blog.newspapers.library.in.gov/hermanbillik.
Sarah Kull and Dolores Kennedy, “Herman Zajicek,” The National Registry of Exonerations, https://www.law.umich.edu/special/exoneration/Pages/casedetailpre1989.aspx?caseid=371.
Deborah Blum, The Poison Squad: One Chemist’s Single-Minded Crusade for Food Safety at the Turn of the Twentieth Century (New York: Penguin Press, 2018).
Deborah Blum, The Poisoner’s Handbook: Murder and the Birth of Forensic Medicine in Jazz Age New York (New York: Penguin Books, 2011).
Linda Civitello, Baking Powder Wars: The Cutthroat Food Fight That Revolutionized Cooking (Chicago: University of Illinois Press, 2017).
Holly Tucker, City of Light, City of Poisons: Murder, Magic, and the First Police Chief of Paris (New York: W. W. Norton, 2017).