Wallace D. Wattles (2015). “Wallace D. Wattles Ultimate Collection – 10 Books in One Volume: The Science of Getting Rich, The Science of Being Well, The Science of Being Great, How to Get What You Want and more: From one of the New Thought pioneers, author of Making of the Man Who Can or How to Promote Yourself and New Science of Living and Healing or Health Through New Thought and Fasting”, p.174, e-artnow
Benjamin Disraeli, Edmund Gosse, Robert Arnot (1904). “The works of Benjamin Disraeli, earl of Beaconsfield: embracing novels, romances, plays, poems, biography, short stories and great speeches”
Friedrich Nietzsche (2017). “THUS SPOKE ZARATHUSTRA (Modern Classics Series): The Magnum Opus of the World’s Most Influential Philosopher, Revolutionary Thinker and the Author of The Antichrist, The Birth of Tragedy & Beyond Good and Evil”, p.37, e-artnow