12 Apr. 2014. http://www.civilwar.org/education/history/biographies/abraham-lincoln.html "Abraham Lincoln." Council on Foreign Relations. Council on Foreign Relations, n.d. Web.
A+E television networks LLC. 2013. Print. 9 March 2014. http://www.biography.com/people/thomas-jefferson-9353715 Selfa, Lance. “Slavery and the origins of racism” Isreview.org.
American National Biography Online: Lincoln, Abraham. Web. 19 May 2014. Freedman, Russell. Lincoln: A Photobiography.
(2013, June 10). Retrieved March 19, 2014, from United States Holocaust Memorial Museum: http://www.ushmm.org/wlc/en/article.php?ModuleId=10005137 Josef Mengele, Angel of Death. (2014). Retrieved March 18, 2014, from Josef Mengele : auschwitz.dk/mengele.htm Gutman, Y., & Berenbaum, M. (1994). Anantomy of the Auschwitz Death Camp.
N.p., n.d. Web. 29 Apr. 2014. "Lincoln Papers: Lincoln Assassination: Introduction."
A&E Networks Television, n.d. Web. 13 Apr. 2014. McPherson, James M. "American National Biography Online: Lincoln, Abraham."
“Abraham Lincoln (president of United States)." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 21 Jan. 2014.
infoplease.com Pearson Education Inc. 2007. Web. 13 Mar., 2014 O'Brien, John. "The Saint Valentine's Day Massacre." Chicago Tribune News.
Worldwarcauses.wikidot.com, 2014. Web. 2 Apr 2014. KAISER, DAVID. "First World War Casualties."
[online] Available at: http://www.examiner.com/article/the-assassination-of-julius-caesar [Accessed 31 Mar. 2014]. Wikipedia, (2014). Alea iacta est. [online] Available at: http://en.wikipedia.org/wiki/Alea_iacta_est [Accessed 3 May.