Wagenknecht, E. C. (1969). William Dean Howells: The friendly eye. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Wagenknecht, Edward Charles. William Dean Howells: The Friendly Eye. New York: Oxford University Press, 1969.
Lua MLA (9ú heag.)Wagenknecht, Edward Charles. William Dean Howells: The Friendly Eye. Oxford University Press, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.