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.40
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
William Cowper (1856). “The task, Table talk, and other poems: With critical observations of various authors on his genius and character, and notes, critical and illustrative”, p.186