Percy Bysshe Shelley (1821). “Queen Mab, a philosophical poem, with notes. [reputed to have been given by the author to W. Francis. Wanting the title-leaf, dedication and part of the last leaf].”, p.158
George MacDonald, Rolland Hein (2004). “The Heart of George MacDonald: A One-Volume Collection of His Most Important Fiction, Essays, Sermons, Drama, and Biographical Information”, p.426, Regent College Publishing