Michel de Montaigne (1850). “Works, Comprising His Essays, Letters, and Journey Through Germany and Italy: With Notes from All the Commentators, Biographical and Bibliographical Notices &c., &c”, p.94
"Harrison Ford, Liam Hemsworth, Amber Heard, Lucas Till, and Director Robert Luketic Talk PARANOIA, Real-Life Parallels, and More". Interview with Sheila Roberts, collider.com. August 12, 2013.
"The theory of the firm in the last ten Years" by Kenneth E. Boulding in "The American Economic Review", Volume 32, No. 4 (pp. 791-802), December 1942.
Michel de Montaigne “Annotated Essays of Michel de Montaigne with English Grammar Exercises: by Michel de Montaigne (Author), Robert Powell (Editor)”, Powell Publications, LLC
"Harrison Ford Talks ENDER’S GAME, Why It’s a Good Family Movie, the Evolution of Space Visual Effects Since STAR WARS, and More". Press conference, collider.com. October 27, 2013.