1. The Documentary History of the Smethwick Engine
2. The Smethwick Engine
3. The Birmingham Canal Company records are held in the British Transport Historical Records in the Public Record Office at Kew. Their general reference is RAIL 810/ followed by the number of the particular document or bundle.
4. The Boulton & Watt Papers are held in the Archives Section of Birmingham Reference Library and are usually referred to as the Boulton & Watt Collection (B&WC).