"Charlotte Tilbury on the Product She Would Use on Kate Middleton, the Surprising Thing in Her Makeup Bag, and More". Interview with Beth Shapouri, www.glamour.com. October 7, 2014.
Ralph Waldo Emerson, Robert Ernest Spiller, Alfred Riggs Ferguson, Joseph Slater, Jean Ferguson Carr (1971). “The Collected Works of Ralph Waldo Emerson: Nature, addresses, and lectures”, p.13, Harvard University Press