Ralph Waldo Emerson, Robert Ernest Spiller, Alfred Riggs Ferguson, Joseph Slater, Jean Ferguson Carr (1971). “The Collected Works of Ralph Waldo Emerson”, p.315, Harvard University Press
United States. President (1974-1977 : Ford), Gerald R. Ford (1975). “Gerald R. Ford: Containing the Public Messages, Speeches, and Statements of the President”
John Buchan (2016). “The Complete Works of John Buchan (Unabridged): Thriller Classics, Spy Novels, Supernatural Tales, Short Stories, Poetry, Historical Works, The Great War Writings, Essays, Biographies & Memoirs – All in One Volume”, p.1649, e-artnow