"His Goal Was to Make It Simple to Use and a Joy to Look at. He Succeeded. The Result Was the iPod". Interview with David Derbyshire, www.telegraph.co.uk. November 19, 2005.
Henry David Thoreau, Jeffrey S. Cramer (2007). “I to Myself: An Annotated Selection from the Journal of Henry D. Thoreau”, p.207, Yale University Press
Samuel Taylor Coleridge (1854). “The complete works: With an introductory essay upon his philosophical and theological opinions. Ed. by [William Greenougl Thayer] Shedd in 7 Vol”, p.57