Specification of the Patent granted to Stephen Perry, of Woodland’s-place, St. John’s-wood, in the County of Middlesex, Gentleman, and Thomas Barnabas Daft, of Birmingham, Manufacturer, for Improvements in Springs to be applied to Girths, Belts, and Bandages, and Improvements in the Manufacture of Elastic Bands. W: Repertory of patent inventions and other discoveries and improvements in arts, manufactures and agriculture. T. VII. Londyn: Macintosh, 1846, s. 211–214. [dostęp 2013-08-22]. (ang.).
