Site)。 《清史稿》 Public Poet, Private Man: Henry Wadsworth Longfellow at 200. HoughtonLibrary - Harvard College Library. [2009-07-03]. (原始内容存档于2010-07-04).
Letters by John R. Smith, "Wilbur H. Siebert Content" (页面存档备份,存于互联网档案馆), HoughtonLibrary, Harvard University. Available as online images (Digitla Collections
Letter Collection, Amherst College Archives and Special Collections (页面存档备份,存于互联网档案馆) John Jeffries Papers[永久失效連結] at HoughtonLibrary, Harvard University