Source: Ovid. Metamorphoses. Trans. Charles Martin. New York: W.W. Norton & Company Ltd., 2004. Web. books.google.com. 2 December 2013. Ovid. Metamorphoses. Trans. A. D. Melville. Oxford: Oxford University Press, 1998. Kindle file. “Ovid.” The Roman Empire in the first Century. pbs.org, 2006. Web. 3 December 2013. Segal, Charles. “Jupiter in Ovid’s Metamorphoses.” Arion: A Journal of Humanities and the Classics Third Series 9.1 (2001): p 78-99. Web. JSTOR. 29 November 2013. “terrificus.” Collins Latin Concise Dictionary. 2003. Print.
Data that has been observed and tested; empirical evidence might include experiential data but traditionally means scientific research and testing, which is most credible if the test has been re-created by different scientists who achieve the same results and conclusions about those results.