Charlotte Bronte, Emily Bronte, Anne Bronte (2009). “The Bronte Sisters: Three Novels: Jane Eyre; Wuthering Heights; and Agnes Grey (Penguin Classics Deluxe Edition)”, p.166, Penguin
BookCaps, Johann Wolfgang von Goethe (2012). “Faust in Plain and Simple English: First Part of the Tragedy: (A Modern Translation and the Original Version): BookCaps Study Guide”, p.18, BookCaps Study Guides