Whitehurst (1973), p. 156. Whitehurst, Brian (1973). Great Western Engines, Names, Numbers, Types and Classes (1940 to Preservation). Oxford, UK: Oxford Publishing Company. ISBN978-0-9028-8821-0. OCLC815661.
Whitehurst (1973), p. 49. Whitehurst, Brian (1973). Great Western Engines, Names, Numbers, Types and Classes (1940 to Preservation). Oxford, UK: Oxford Publishing Company. ISBN978-0-9028-8821-0. OCLC815661.