Aldo Leopold (2013). “Aldo Leopold: A Sand County Almanac & Other Writings on Conservation and Ecology: (Library of America #238)”, p.164, Library of America
Dormer Creston, Robert Browning, Elizabeth Barrett Browning (1943). “Andromeda in Wimpole Street: the love story of Robert and Elizabeth Browning told in their letters”
Christopher Marlowe (2014). “Christopher Marlowe: Four Plays: Tamburlaine, Parts One and Two, The Jew of Malta, Edward II and Dr Faustus”, p.305, Bloomsbury Publishing