Book: White, William. 1871 White's General and Commercial Directory of Sheffield and All the Boroughs, Parishes, Townships, and Villages Within a Distance of Twenty Miles.
• See entry for William and Samuel Butcher for an illustration of Butcher Company mark.Book: Goodman, W. L. 1978 British Plane Makers from 1700: 2nd Edition.
• For information on William and Sam Butcher's dates of activity, see page 168.Book: Salaman, Raphael Arthur. 1990 Dictionary of Woodworking Tools c. 1700 -1970 and tools of allied trades.
• For a description of compass planes, see page 315.