Pickard, J. B. (1961). John Greenleaf Whittier: An introduction and interpretation. Barnes & Noble.
Lua i Stíl Chicago (17ú heag.)Pickard, John B. John Greenleaf Whittier: An Introduction and Interpretation. New York: Barnes & Noble, 1961.
Lua MLA (9ú heag.)Pickard, John B. John Greenleaf Whittier: An Introduction and Interpretation. Barnes & Noble, 1961.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.