John Milton (1873). “The Poetical Works of John Milton: With a Life of the Author, Preliminary Dissertations on Each Poem, Notes Critical and Explanatory, an Index to the Subjects of Paradise Lost, and a Verbal Index to All the Poems”, p.255
George MacDonald (2015). “George MacDonald: The Complete Fantasy Collection - 8 Novels & 30+ Short Stories and Fairy Tales (Illustrated): The Princess and the Goblin, Lilith, Phantastes, The Princess and Curdie, At the Back of the North Wind, Portent, The Lost Princess, Adela Cathcart, Dealings with the Fairies and many more”, p.444, e-artnow