John Milton (1801). “The Poetical Works of John Milton: With the Principal Notes of Various Commentators. To which are Added Illustrations, with Some Account of the Life of Milton”, p.43
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.212, Grove Press