James Burgh (1767). “The Dignity of Human Nature: Or, A Brief Account of the Certain and Established Means for Attaining the True End of Our Existence. In Four Books ...”, p.38
"Spike Lee Talks OLDBOY, Why He Considers the Film a Reinterpretation, Performances of Josh Brolin and Elizabeth Olsen & His Confidence in Audience Turnout". Interview with Sheila Roberts, collider.com. November 17, 2013.