John Gardiner Calkins BRAINARD (1842). “The Poems of John G. C. Brainard. A New and Authentic Collection, with an Original Memoir of His Life. [With a Portrait.]”, p.19
Omar Khayyam, Edward FitzGerald, Christopher Decker (1997). “Edward FitzGerald, Rubáiyát of Omar Khayyám: A Critical Edition”, p.167, University of Virginia Press
"I've devised a game for bland celebrity interviews: swap one star's questions with another's answers" by Sharon Horgan, www.theguardian.com. August 20, 2008.