Christopher Decker, ed., "Introduction: Postscript" Edward FitzGerald, Rubáiyát of Omar Khayyám: a critical edition University Press of Virginia, Charlottesville, Virginia, page xlv, 1997. ISBN0-8139-1689-5
Frederick A. Manchester and William F. Giese, eds, Harper's anthology for college courses in composition and literatureHarper & Brothers, New York, vol. 2, 1926, p. 685, OCLC 1743706 Worldcat.org.