Thomas Gray, John MITFORD (Vicar of Benhall.) (1814). “The Poems of Thomas Gray. With Critical Notes, a Life of the Author, and an Essay on His Poetry, by the Rev. John Mitford”, p.69
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
Immanuel Kant (1887). “The Philosophy of Law: An Exposition of the Fundamental Principles of Jurisprudence as the Science of Right”, p.230, The Lawbook Exchange, Ltd.