Samuel Johnson (1823). “The Works of Samuel Johnson: LL.D. A New Edition in Twelve Volumes. With an Essay on His Life and Genius, by Arthur Murphy, Esq”, p.76
"SOUND OFF Special Interview: Josh Young Talks Solo Album, AMAZING GRACE Workshop & More". Interview with Pat Cerasaro, www.broadwayworld.com. December 7, 2012.
"Newton and the Twentieth Century - A Personal View" by Hermann Bondi in "Let Newton Bel A New Perspective on his Life and Works" by R. Flood, J. Fauvel, M. Shortland, R. Wilson (p. 241), 1988.