George Bernard Shaw (2015). “The Collected Plays of George Bernard Shaw (Illustrated): Including Renowned Titles like Pygmalion, Mrs. Warren’s Profession, Candida, Arms and The Man, Man and Superman, The Inca Of Perusalem, Macbeth Skit, Caesar and Cleopatra, Androcles And The Lion”, p.1040, e-artnow
William Shakespeare (2013). “Histories of Shakespeare in Plain and Simple English (a Modern Translation and the Original Version)”, p.117, BookCaps Study Guides
"Morgan Freeman Talks OBLIVION, Working with Tom Cruise, Being Drawn to Sci-Fi and Technology, Shooting a Dual .50 Caliber Machine Gun and More". Interview with Sheila Roberts, collider.com. April 16, 2013.