William Cowper, James Thomson (1832). “The Works of Cowper and Thompson: Including Many Letters and Poems Never Before Published in this Country. With a New and Interesting Memoir of the Life of Thomson”, p.73
Ralph Waldo Emerson (1844). “An Address Delivered in the Court-house in Concord, Massachusetts, on 1st August, 1844: On the Anniversary of the Emancipation of the Negroes in the British West Indies”, p.30