West, Annabel, Fringe, Frog and Tassel. The Art of the Trimmings-Maker in Interior Decoration in Britain and Ireland (London: Philip Wilson and the National Trust, 2019, ISBN 978 1 78130 075 6), pp. 97-98, fig. 5:13 Gill, Kathryn, 'Eighteenth-century close fitting detachable covers preserved at Houghton Hall: A techinical study', in Kathryn Gill and Dinah Eastop eds., Upholstery Conservation Principles and Practice (Oxford, 2001), pp. 133-144.