Walt Whitman, Sculley Bradley, Harold W. Blodgett, Arthur Golden, William White (2008). “Leaves of Grass: Vol. I-III: A Textual Variorum of the Printed Poems, 1855-1856”, p.643, NYU Press
John Milton (2013). “Paradise Lost Simplified!: Includes Modern Translation, Study Guide, Historical Context, Biography, and Character Index”, p.508, BookCaps Study Guides