William Butler Yeats, Richard J. Finneran, George Bornstein (2007). “The Collected Works of W.B. Yeats Volume IV: Early Essays”, p.7, Simon and Schuster
William Butler Yeats, Richard J. Finneran, George Bornstein (2007). “The Collected Works of W.B. Yeats Volume IV: Early Essays”, p.82, Simon and Schuster
O. Henry (2015). “The Complete Poetry of O. Henry (Including a Biography of the Author): From the American writer, a master of short stories, known for The Gift of the Magi, Cabbages and Kings, The Cop and the Anthem, Options, Roads of Destiny, The Four Million…”, p.146, e-artnow
Edgar Rice Burroughs (2015). “TARZAN OF THE APES SERIES - Complete Collection: 25 Novels in One Volume (Illustrated): The Return of Tarzan, The Beasts of Tarzan, The Son of Tarzan, Tarzan and the Jewels of Opar, Jungle Tales of Tarzan, Tarzan the Untamed, Tarzan and the Golden Lion, Tarzan the Terrible and many more”, p.5, e-artnow