Korf & Rubenstein (2005), p. 61 Korf, Bruce R.; Rubenstein, Allan E., Neurofibromatosis: A Handbook for Patients, Families, and Health Care Professionals, New York: Thieme Medical Publishers, 2005, ISBN 158890301X, OCLC 469950989
Durbach (2009), p. 34 Durbach, Nadja, Monstrosity, Masculinity, and Medicine: Reexamining 'the Elephant Man', The Spectacle of Deformity: Freak Shows and Modern British Culture, Berkeley: University of California Press, 2009, ISBN 0520257685, OCLC 314839375
Durbach (2009), pp. 37–38 Durbach, Nadja, Monstrosity, Masculinity, and Medicine: Reexamining 'the Elephant Man', The Spectacle of Deformity: Freak Shows and Modern British Culture, Berkeley: University of California Press, 2009, ISBN 0520257685, OCLC 314839375