"David Tennant Talks GRACEPOINT, Working on His American Accent, Possibility of Future Seasons, and More". Interview with Christina Radish, collider.com. September 30, 2014.
Charlotte Bronte, Emily Bronte, Anne Bronte (2009). “The Bronte Sisters: Three Novels: Jane Eyre; Wuthering Heights; and Agnes Grey (Penguin Classics Deluxe Edition)”, p.256, Penguin