Oscar Wilde, Russell Jackson, Joseph Bristow, Ian Small (2000). “The Complete Works of Oscar Wilde: The picture of Dorian Gray : the 1890 and 1891 texts”, p.22, Oxford University Press on Demand
Dante Alighieri (2013). “The Divine Comedy Reference With Modern English Translation of the Epic Poem: Includes Study Guide, Historical Context, Biography, and Character Index”, p.1616, BookCaps Study Guides