Omar Khayyam, Edward FitzGerald, Christopher Decker (1997). “Edward FitzGerald, Rubáiyát of Omar Khayyám: A Critical Edition”, p.121, University of Virginia Press
Herman Melville (1863). “Redburn: His First Voyage: Being the Sailor-boy Confessions and Reminiscences O the Son-of-a-gentleman, in the Merchant Service”, p.376