Title: Whittier and His Poetry (Barnes & Noble Digital Library), Author: William Henry Hudson
Title: The John Greenleaf Whittier (Barnes & Noble Digital Library): His Life and Work, Author: Georgina King Lewis
Title: John Greenleaf Whittier (Barnes & Noble Digital Library): English Men of Letters Series, Author: Thomas  Wentworth Higginson
Title: John Greenleaf Whittier (Barnes & Noble Digital Library), Author: Richard Francis Burton