John Ruskin (1800). “The Seven Lamps of Architecture: Also, Lectures on Architecture and Painting; The Study of Architecture; Sesame and Lilies; Unto this Last; The Queen of the Air; The Storm-cloud of the Nineteenth Century”
John Ruskin (1868). “Time and Tide, by Weare and Tyne. Twenty-five letters to a Working Man of Sunderland (Thomas Dixon) on the laws of work ... Second edition”, p.37