William Cowper (1855). “The Works of William Cowper: His Life, Letters, and Poems : Now First Completed by the Introduction of Cowper's Private Correspondence”, p.677
Reginald Heber, Amelia Heber (1830). “The Life of Reginald Heber, D.D. Lord Bishop of Calcutta: With Selections from His Correspondence, Unpublished Poems, and Private Papers : Together with a Journal of His Tour in Norway, Sweden, Russia, Hungary and Germany, and a History of the Cosacks ; in Two Volumes”, p.30