Sands, Stella. "Leonardo da Vinci." Kids Discover. February 1997. Pages 1-15.
Kelen, Emry. Fantastic Tales, Strange Animals, Riddles, Jests, and Prophecies of Leonardo da Vinci. Canada: Thomas Nelson and Sons, 1971.
Whiting, Roger. Leonardo. London: Quarto Publishing plc, 1992.
We would like to thank: leonardo.net, home of the Leonardo Virtual Museum for allowing us to use their pictures of Leonardo's works, and our coach, Julie Gittings, who was there to eternally remind us of upcoming deadlines.
Thanks also goes out to Doctor Roland Wilkerson, former world cultures teacher at the State College Area High School, who helped kindle a life-long love of history.