The Borgias

http://www.historytoday.com/blog/2013/10/were-borgias-really-so-bad

http://europeanhistory.about.com/od/italyandthecitystates/a/The-Borgias.htm

http://blogs.wsj.com/speakeasy/2011/04/17/sex-bribery-murder-the-real-story-behind-the-borgias/

http://sarahdunant.com/telling-it-like-it-really-is-the-borgias-on-screen-and-on-the-page/

http://www.notablebiographies.com/Be-Br/Borgia-Lucrezia.html