Ludwig Wittgenstein (1974). “Philosophical Grammar: Part I, The Proposition, and Its Sense, Part II, On Logic and Mathematics”, p.162, Univ of California Press
Octavio Paz (1985). “The Labyrinth of Solitude: And the Other Mexico ; Return to the Labyrinth of Solitude ; Mexico and the United States ; The Philanthropic Ogre”, p.263, Grove Press
Edgar Allan Poe (2014). “Complete Collection of Edgar Allan Poe - 170+ eBooks (Complete Tales, Poems, Novels, Essays, Miscellaneous, Play)”, p.1206, Ageless Reads