Thomas De Quincey, James Thomas Fields (1854). “De Quincey's Writings: Essays on philosophical writers and other men of letters. 1854-60. [v. 14 stereotyped”, p.103
Interview in "Artforum" Magazine, November 1969; as quoted in "Six Years: The Dematerialization of the Art Object from 1966 to 1972" by Lucy R. Lippard, University of California Press, (p. 121), 1973.
Mary Wollstonecraft Shelley (1988). “Frankenstein, Or, The Modern Prometheus: With Supplementary Essays and Poems from the Twentieth Century”, p.32, Orchises Press